diff --git a/includes/activitypub/transformer/class-events-manager.php b/includes/activitypub/transformer/class-events-manager.php
index 476fe2c..ccd2b13 100644
--- a/includes/activitypub/transformer/class-events-manager.php
+++ b/includes/activitypub/transformer/class-events-manager.php
@@ -23,7 +23,7 @@ if ( ! defined( 'ABSPATH' ) ) {
  *
  * @since 1.0.0
  */
-class Events_Manager extends Event_Transformer {
+final class Events_Manager extends Event_Transformer {
 
 	/**
 	 * Holds the EM_Event object.
diff --git a/includes/activitypub/transformer/class-gatherpress.php b/includes/activitypub/transformer/class-gatherpress.php
index 077c600..6ff8b4d 100644
--- a/includes/activitypub/transformer/class-gatherpress.php
+++ b/includes/activitypub/transformer/class-gatherpress.php
@@ -23,7 +23,7 @@ if ( ! defined( 'ABSPATH' ) ) {
  *
  * @since 1.0.0
  */
-class GatherPress extends Event {
+final class GatherPress extends Event {
 
 	/**
 	 * The target ActivityPub Event object of the transformer.
diff --git a/includes/activitypub/transformer/class-the-events-calendar.php b/includes/activitypub/transformer/class-the-events-calendar.php
index acfa499..1c40e95 100644
--- a/includes/activitypub/transformer/class-the-events-calendar.php
+++ b/includes/activitypub/transformer/class-the-events-calendar.php
@@ -22,7 +22,7 @@ use WP_Post;
  *
  * @since 1.0.0
  */
-class The_Events_Calendar extends Event {
+final class The_Events_Calendar extends Event {
 
 	/**
 	 * The Tribe Event object.
@@ -38,9 +38,10 @@ class The_Events_Calendar extends Event {
 	 * has a lot of useful functions, we make use of our getter functions.
 	 *
 	 * @param WP_Post $wp_object The WordPress object.
+	 * @param string  $wp_taxonomy The taxonomy slug of the event post type.
 	 */
-	public function __construct( $wp_object ) {
-		parent::__construct( $wp_object );
+	public function __construct( $wp_object, $wp_taxonomy ) {
+		parent::__construct( $wp_object, $wp_taxonomy );
 		$this->tribe_event = \tribe_get_event( $wp_object );
 	}
 
diff --git a/includes/activitypub/transformer/class-vs-event-list.php b/includes/activitypub/transformer/class-vs-event-list.php
index 8eb6af3..a91e5f1 100644
--- a/includes/activitypub/transformer/class-vs-event-list.php
+++ b/includes/activitypub/transformer/class-vs-event-list.php
@@ -26,7 +26,7 @@ if ( ! defined( 'ABSPATH' ) ) {
  *
  * @since 1.0.0
  */
-class VS_Event_List extends Event_Transformer {
+final class VS_Event_List extends Event_Transformer {
 
 	/**
 	 * The target transformer ActivityPub Event object.
@@ -44,7 +44,7 @@ class VS_Event_List extends Event_Transformer {
 	 * @access public
 	 * @return string Widget name.
 	 */
-	public function get_transformer_name() {
+	public function get_transformer_name(): string {
 		return 'activitypub-event-transformers/vs-event';
 	}
 
@@ -57,7 +57,7 @@ class VS_Event_List extends Event_Transformer {
 	 * @access public
 	 * @return string Widget title.
 	 */
-	public function get_transformer_label() {
+	public function get_transformer_label(): string {
 		return 'VS Event';
 	}
 
@@ -70,7 +70,7 @@ class VS_Event_List extends Event_Transformer {
 	 * @access public
 	 * @return array Widget categories.
 	 */
-	public static function get_supported_post_types() {
+	public static function get_supported_post_types(): string {
 		return array( 'event' );
 	}
 
@@ -81,16 +81,16 @@ class VS_Event_List extends Event_Transformer {
 	 * @since 1.0.0
 	 * @return string The Event Object-Type.
 	 */
-	protected function get_type() {
+	protected function get_type(): string {
 		return 'Event';
 	}
 
 	/**
 	 * Get the event location.
 	 *
-	 * @return array The Place.
+	 * @return Place The Place.
 	 */
-	public function get_location() {
+	public function get_location(): Place {
 		$address = get_post_meta( $this->wp_object->ID, 'event-location', true );
 		$place   = new Place();
 		$place->set_type( 'Place' );
@@ -102,7 +102,7 @@ class VS_Event_List extends Event_Transformer {
 	/**
 	 * Get the end time from the events metadata.
 	 */
-	protected function get_end_time() {
+	protected function get_end_time(): string {
 		$end_time = get_post_meta( $this->wp_object->ID, 'event-date', true );
 		return \gmdate( 'Y-m-d\TH:i:s\Z', $end_time );
 	}
@@ -110,7 +110,7 @@ class VS_Event_List extends Event_Transformer {
 	/**
 	 * Get the end time from the events metadata.
 	 */
-	protected function get_start_time() {
+	protected function get_start_time(): string {
 		$start_time = get_post_meta( $this->wp_object->ID, 'event-start-date', true );
 		return \gmdate( 'Y-m-d\TH:i:s\Z', $start_time );
 	}
@@ -118,7 +118,7 @@ class VS_Event_List extends Event_Transformer {
 	/**
 	 * Get the event link from the events metadata.
 	 */
-	private function get_event_link() {
+	private function get_event_link(): array {
 		$event_link = get_post_meta( $this->wp_object->ID, 'event-link', true );
 		if ( $event_link ) {
 			return array(
diff --git a/includes/admin/class-event-plugin-admin-notices.php b/includes/admin/class-event-plugin-admin-notices.php
index 82e8670..9340e81 100644
--- a/includes/admin/class-event-plugin-admin-notices.php
+++ b/includes/admin/class-event-plugin-admin-notices.php
@@ -11,6 +11,8 @@
 
 namespace Activitypub_Event_Extensions\Admin;
 
+use Activitypub_Event_Extensions\Plugins\Event_Plugin;
+
 /**
  * Class responsible for Event Plugin related admin notices.
  *
@@ -22,14 +24,14 @@ class Event_Plugin_Admin_Notices {
 	/**
 	 * Information about the event plugin.
 	 *
-	 * @var array
+	 * @var Event_Plugin
 	 */
 	protected $event_plugin;
 
 	/**
 	 * Adds admin notices to an active supported event plugin.
 	 *
-	 * @param array $event_plugin Information about the activate event plugin.
+	 * @param Event_Plugin $event_plugin Class that has implements functions to handle a certain supported activate event plugin.
 	 */
 	public function __construct( $event_plugin ) {
 		$this->event_plugin = $event_plugin;
@@ -43,32 +45,28 @@ class Event_Plugin_Admin_Notices {
 	 *
 	 * @return bool
 	 */
-	private function event_post_type_is_not_activitypub_enabled() {
-		return ! in_array( $this->event_plugin['post_type'], get_option( 'activitypub_support_post_types', array() ), true );
+	private function event_post_type_is_not_activitypub_enabled(): bool {
+		return ! in_array( $this->event_plugin::get_post_type(), get_option( 'activitypub_support_post_types', array() ), true );
 	}
 
 	/**
 	 * Display the admin notices for the plugins.
+	 *
+	 * @return void
 	 */
-	public function admin_notice_activitypub_not_enabled_for_post_type() {
-		// Get the current page.
-		$screen = get_current_screen();
-		// Check if we are on a edit page for the event, or on the settings page of the event plugin.
-		$is_event_plugins_edit_page     = 'edit' === $screen->base && $this->event_plugin['post_type'] === $screen->post_type;
-		$is_event_plugins_settings_page = $this->event_plugin['settings_page_id'] === $screen->id;
-
-		if ( $is_event_plugins_edit_page || $is_event_plugins_settings_page ) {
-			$this->do_admin_notice_post_type_not_activitypub_enabled( $this->event_plugin['plugin_file'] );
+	public function admin_notice_activitypub_not_enabled_for_post_type(): void {
+		if ( $this->event_plugin::is_plugin_page() ) {
+			$this->do_admin_notice_post_type_not_activitypub_enabled();
 		}
 	}
 
 	/**
 	 * Print admin notice that the current post type is not enabled in the ActivityPub plugin.
 	 *
-	 * @param string $event_plugin_file The event plugin file path.
+	 * @return void
 	 */
-	private function do_admin_notice_post_type_not_activitypub_enabled( $event_plugin_file ) {
-		$event_plugin_data       = get_plugin_data( WP_PLUGIN_DIR . '/' . $event_plugin_file );
+	private function do_admin_notice_post_type_not_activitypub_enabled(): void {
+		$event_plugin_data       = get_plugin_data( WP_PLUGIN_DIR . '/' . $this->event_plugin::get_plugin_file() );
 		$activitypub_plugin_data = get_plugin_data( ACTIVITYPUB_PLUGIN_FILE );
 		$notice                  = sprintf(
 			/* translators: 1: the name of the event plugin a admin notice is shown. 2: The name of the ActivityPub plugin. */
diff --git a/includes/admin/class-general-admin-notices.php b/includes/admin/class-general-admin-notices.php
index 8c69512..a4de156 100644
--- a/includes/admin/class-general-admin-notices.php
+++ b/includes/admin/class-general-admin-notices.php
@@ -84,7 +84,7 @@ class General_Admin_Notices {
 	 *
 	 * @return void
 	 */
-	public static function activitypub_plugin_not_enabled() {
+	public static function activitypub_plugin_not_enabled(): void {
 		$notice = self::get_admin_notice_activitypub_plugin_not_enabled();
 		echo '<div class="notice notice-warning"><p>' . \wp_kses( $notice, self::ALLOWED_HTML ) . '</p></div>';
 	}
@@ -94,7 +94,7 @@ class General_Admin_Notices {
 	 *
 	 * @return void
 	 */
-	public static function no_supported_event_plugin_active() {
+	public static function no_supported_event_plugin_active(): void {
 		$notice = self::get_admin_notice_no_supported_event_plugin_active();
 		echo '<div class="notice notice-warning"><p>' . \wp_kses( $notice, self::ALLOWED_HTML ) . '</p></div>';
 	}
diff --git a/includes/admin/class-settings-page.php b/includes/admin/class-settings-page.php
index 22c8b1a..2a3b569 100644
--- a/includes/admin/class-settings-page.php
+++ b/includes/admin/class-settings-page.php
@@ -12,6 +12,7 @@
 namespace Activitypub_Event_Extensions\Admin;
 
 use Activitypub_Event_Extensions\Setup;
+use Activitypub_Event_Extensions\Plugins\Event_Plugin;
 
 // Exit if accessed directly.
 defined( 'ABSPATH' ) || exit; // @codeCoverageIgnore
@@ -59,19 +60,20 @@ class Settings_Page {
 	/**
 	 * Receive the event categories (terms) used by the event plugin.
 	 *
-	 * @param array $event_plugin Contains info about a certain event plugin.
+	 * @param Event_Plugin $event_plugin Contains info about a certain event plugin.
 	 *
 	 * @return array An array of Terms.
 	 */
 	private static function get_event_terms( $event_plugin ) {
-		if ( isset( $event_plugin['taxonomy'] ) ) {
+		$taxonomy = $event_plugin::get_taxonomy();
+		if ( $taxonomy ) {
 			$event_terms = get_terms(
 				array(
-					'taxonomy'   => $event_plugin['taxonomy'],
+					'taxonomy'   => $taxonomy,
 					'hide_empty' => true,
 				)
 			);
-			return $event_terms;
+			return ! is_wp_error( $event_terms ) ? $event_terms : array();
 		} else {
 			return array();
 		}
@@ -87,8 +89,8 @@ class Settings_Page {
 
 		$event_terms = array();
 
-		foreach ( $event_plugins as $event_plugin_name => $events_plugin_info ) {
-			$event_terms = array_merge( $event_terms, self::get_event_terms( $events_plugin_info ) );
+		foreach ( $event_plugins as $event_plugin ) {
+			$event_terms = array_merge( $event_terms, self::get_event_terms( $event_plugin ) );
 		}
 
 		$args = array(
diff --git a/includes/class-settings.php b/includes/class-settings.php
index 26248af..ceec701 100644
--- a/includes/class-settings.php
+++ b/includes/class-settings.php
@@ -26,12 +26,19 @@ defined( 'ABSPATH' ) || exit; // @codeCoverageIgnore
 class Settings {
 	const SETTINGS_SLUG = 'activitypub-event-extensions';
 
+	/**
+	 * The default ActivityPub event category.
+	 *
+	 * @var string
+	 */
 	const DEFAULT_EVENT_CATEGORY = 'MEETING';
 
 	/**
 	 * Register the settings for the ActivityPub Event Extensions plugin.
+	 *
+	 * @return void
 	 */
-	public static function register_settings() {
+	public static function register_settings(): void {
 		\register_setting(
 			'activitypub-event-extensions',
 			'activitypub_event_extensions_default_event_category',
@@ -61,7 +68,7 @@ class Settings {
 	 *
 	 * @param string $event_category The ActivityPUb event category.
 	 */
-	public static function sanitize_mapped_event_category( $event_category ) {
+	public static function sanitize_mapped_event_category( $event_category ): string {
 		return self::is_allowed_event_category( $event_category ) ? $event_category : self::DEFAULT_EVENT_CATEGORY;
 	}
 
@@ -71,8 +78,10 @@ class Settings {
 	 * Currently only the default event categories are allowed to be target of a mapping.
 	 *
 	 * @param array $event_category_mappings The settings value.
+	 *
+	 * @return array An array that contains only valid mapping pairs.
 	 */
-	public static function sanitize_event_category_mappings( $event_category_mappings ) {
+	public static function sanitize_event_category_mappings( $event_category_mappings ): array {
 		if ( empty( $event_category_mappings ) ) {
 			return array();
 		}
@@ -91,7 +100,7 @@ class Settings {
 	 *
 	 * @return bool True if allowed, false otherwise.
 	 */
-	private static function is_allowed_event_category( $event_category ) {
+	private static function is_allowed_event_category( $event_category ): bool {
 		$allowed_event_categories = Event::DEFAULT_EVENT_CATEGORIES;
 		return in_array( $event_category, $allowed_event_categories, true );
 	}
diff --git a/includes/class-setup.php b/includes/class-setup.php
index 2a25e12..e075ee0 100644
--- a/includes/class-setup.php
+++ b/includes/class-setup.php
@@ -15,6 +15,7 @@ namespace Activitypub_Event_Extensions;
 use Activitypub_Event_Extensions\Admin\Event_Plugin_Admin_Notices;
 use Activitypub_Event_Extensions\Admin\General_Admin_Notices;
 use Activitypub_Event_Extensions\Admin\Settings_Page;
+use Activitypub_Event_Extensions\Plugins\Event_Plugin;
 
 // Exit if accessed directly.
 defined( 'ABSPATH' ) || exit; // @codeCoverageIgnore
@@ -29,34 +30,6 @@ require_once ABSPATH . 'wp-admin/includes/plugin.php';
  * @since 1.0.0
  */
 class Setup {
-	const SUPPORTED_EVENT_PLUGINS = array(
-		'events_manager'      => array(
-			'plugin_file'       => 'events-manager/events-manager.php',
-			'post_type'         => 'event',
-			'settings_page'     => 'options-general.php?page=vsel',
-			'transformer_class' => 'Events_Manager',
-		),
-		'gatherpress'         => array(
-			'plugin_file'       => 'gatherpress/gatherpress.php',
-			'post_type'         => 'gatherpress_event',
-			'transformer_class' => 'GatherPress',
-			'settings_page_id'  => 'gatherpress_general',
-		),
-		'the_events_calendar' => array(
-			'plugin_file'       => 'the-events-calendar/the-events-calendar.php',
-			'post_type'         => 'tribe_events',
-			'transformer_class' => 'Tribe',
-			'settings_page_id'  => 'tribe_general',
-		),
-		'vsel'                => array(
-			'plugin_file'       => 'very-simple-event-list/vsel.php',
-			'post_type'         => 'event',
-			'settings_page_id'  => 'settings_page_vsel',
-			'transformer_class' => 'VS_Event_List',
-			'taxonomy'          => 'event_cat',
-		),
-	);
-
 	/**
 	 * Keep the information whether the ActivityPub plugin is active.
 	 *
@@ -67,7 +40,7 @@ class Setup {
 	/**
 	 * Holds an array of the currently activated supported event plugins.
 	 *
-	 * @var array
+	 * @var Event_Plugin[]
 	 */
 	protected $active_event_plugins = array();
 
@@ -80,7 +53,7 @@ class Setup {
 	 */
 	protected function __construct() {
 		$this->activitypub_plugin_is_active = is_plugin_active( 'activitypub/activitypub.php' );
-		$this->active_event_plugins         = self::detect_supported_event_plugins();
+		$this->active_event_plugins         = self::detect_active_event_plugins();
 		$this->setup_hooks();
 	}
 
@@ -109,40 +82,47 @@ class Setup {
 		return self::$instance;
 	}
 
-	public static function get_event_plugins() {
-        // Get all plugin definition classes from the includes/plugins folder.
-        $plugin_files = glob( ACTIVITYPUB_EVENT_EXTENSIONS_PLUGIN_DIR . 'includes/plugins/class-*.php' );
-
-		foreach ( $plugin_files as $plugin_file ) {
-			require_once $plugin_file;
-			
-		}
-        return $basenames;
+	/**
+	 * Getter function for the active event plugins.
+	 *
+	 * @return Event_Plugin[]
+	 */
+	public function get_active_event_plugins() {
+		return $this->active_event_plugins;
 	}
 
+	/**
+	 * Holds all the classes for the supported event plugins.
+	 *
+	 * @var array
+	 */
+	private const EVENT_PLUGIN_CLASSES = array(
+		'\Activitypub_Event_Extensions\Plugins\Events_Manager',
+		'\Activitypub_Event_Extensions\Plugins\GatherPress',
+		'\Activitypub_Event_Extensions\Plugins\The_Events_Calendar',
+		'\Activitypub_Event_Extensions\Plugins\VS_Event_List',
+	);
+
 	/**
 	 * Function that checks for supported activated event plugins.
 	 *
 	 * @return array List of supported event plugins as keys from the SUPPORTED_EVENT_PLUGINS const.
 	 */
-	public static function detect_supported_event_plugins(): array {
+	public static function detect_active_event_plugins(): array {
 		$active_event_plugins = array();
-		foreach ( self::SUPPORTED_EVENT_PLUGINS as $event_plugin_key => $event_plugin ) {
-			if ( \is_plugin_active( $event_plugin['plugin_file'] ) ) {
-				$active_event_plugins[ $event_plugin_key ] = $event_plugin;
+
+		foreach ( self::EVENT_PLUGIN_CLASSES as $event_plugin_class ) {
+			if ( ! class_exists( $event_plugin_class ) || ! method_exists( $event_plugin_class, 'get_plugin_file' ) ) {
+				continue;
+			}
+			$event_plugin_file = call_user_func( array( $event_plugin_class, 'get_plugin_file' ) );
+			if ( \is_plugin_active( $event_plugin_file ) ) {
+				$active_event_plugins[] = new $event_plugin_class();
 			}
 		}
 		return $active_event_plugins;
 	}
 
-	/**
-	 * Getter function for the active event plugins.
-	 */
-	public function get_active_event_plugins() {
-		return $this->active_event_plugins;
-	}
-
-
 	/**
 	 * Set up hooks for various purposes.
 	 *
@@ -178,8 +158,10 @@ class Setup {
 	 * Add the CSS for the admin pages.
 	 *
 	 * @param string $hook_suffix The suffix of the hook.
+	 *
+	 * @return void
 	 */
-	public static function enqueue_styles( $hook_suffix ) {
+	public static function enqueue_styles( $hook_suffix ): void {
 		if ( false !== strpos( $hook_suffix, 'activitypub-event-extensions' ) ) {
 			wp_enqueue_style(
 				'activitypub-event-extensions-admin-styles',
@@ -229,9 +211,11 @@ class Setup {
 
 		// Get the transformer for a specific event plugins event-post type.
 		foreach ( $this->active_event_plugins as $event_plugin ) {
-			if ( $wp_object->post_type === $event_plugin['post_type'] ) {
-				$transformer_class = 'Activitypub_Event_Extensions\Activitypub\Transformer\\' . $event_plugin['transformer_class'];
-				return new $transformer_class( $wp_object, $event_plugin['taxonomy'] );
+			if ( $wp_object->post_type === $event_plugin->get_post_type() ) {
+				$transformer_class = $event_plugin->get_activitypub_event_transformer_class();
+				if ( class_exists( $transformer_class ) ) {
+					return new $transformer_class( $wp_object, $event_plugin->get_taxonomy() );
+				}
 			}
 		}
 
@@ -266,7 +250,7 @@ class Setup {
 	 *
 	 * @return void
 	 */
-	public function activate() {
+	public function activate(): void {
 		// Don't allow plugin activation, when the ActivityPub plugin is not activated yet.
 		if ( ! $this->activitypub_plugin_is_active ) {
 			deactivate_plugins( plugin_basename( ACTIVITYPUB_EVENT_EXTENSIONS_PLUGIN_FILE ) );
diff --git a/includes/plugins/class-event-plugin.php b/includes/plugins/class-event-plugin.php
new file mode 100644
index 0000000..25b753b
--- /dev/null
+++ b/includes/plugins/class-event-plugin.php
@@ -0,0 +1,76 @@
+<?php
+/**
+ * Interface for defining supported Event Plugins.
+ *
+ * Basic information that each supported event needs for this plugin to work.
+ *
+ * @package Activitypub_Event_Extensions
+ * @since 1.0.0
+ */
+
+namespace Activitypub_Event_Extensions\Plugins;
+
+use Activitypub_Event_Extensions\Activitypub\Transformer\Event as Event_Transformer;
+
+// Exit if accessed directly.
+defined( 'ABSPATH' ) || exit; // @codeCoverageIgnore
+
+/**
+ * Interface for a supported event plugin.
+ *
+ * This interface defines which information is necessary for a supported event plugin.
+ *
+ * @since 1.0.0
+ */
+abstract class Event_Plugin {
+	/**
+	 * Returns the full plugin file.
+	 *
+	 * @return string
+	 */
+	abstract public static function get_plugin_file(): string;
+
+	/**
+	 * Returns the event post type of the plugin.
+	 *
+	 * @return string
+	 */
+	abstract public static function get_post_type(): string;
+
+	/**
+	 * Returns the taxonomy used for the plugin's event categories.
+	 *
+	 * @return string
+	 */
+	abstract public static function get_taxonomy(): string;
+
+	/**
+	 * Returns the ID of the main settings page of the plugin.
+	 *
+	 * @return string The settings page url.
+	 */
+	public static function get_settings_page(): string {
+		return '';
+	}
+
+	/**
+	 * Detects whether the current screen is a admin page of the event plugin.
+	 */
+	public static function is_plugin_page(): bool {
+		// Get the current page.
+		$screen = get_current_screen();
+
+		// Check if we are on a edit page for the event, or on the settings page of the event plugin.
+		$is_event_plugins_edit_page     = 'edit' === $screen->base && static::get_post_type() === $screen->post_type;
+		$is_event_plugins_settings_page = static::get_settings_page() === $screen->id;
+
+		return $is_event_plugins_edit_page || $is_event_plugins_settings_page;
+	}
+
+	/**
+	 * Returns the Activitypub transformer for the event plugins event post type.
+	 */
+	public static function get_activitypub_event_transformer_class(): string {
+		return str_replace( 'Plugins', 'Activitypub\Transformer', static::class );
+	}
+}
diff --git a/includes/plugins/class-events-manager.php b/includes/plugins/class-events-manager.php
index f50920e..26a8926 100644
--- a/includes/plugins/class-events-manager.php
+++ b/includes/plugins/class-events-manager.php
@@ -14,8 +14,6 @@ namespace Activitypub_Event_Extensions\Plugins;
 // Exit if accessed directly.
 defined( 'ABSPATH' ) || exit; // @codeCoverageIgnore
 
-require_once __DIR__ . '/interface-event-plugin.php';
-
 /**
  * Interface for a supported event plugin.
  *
@@ -23,14 +21,14 @@ require_once __DIR__ . '/interface-event-plugin.php';
  *
  * @since 1.0.0
  */
-class Events_Manager implements Event_Plugin {
+final class Events_Manager extends Event_Plugin {
 	/**
 	 * Returns the full plugin file.
 	 *
 	 * @return string
 	 */
 	public static function get_plugin_file(): string {
-		return 'the-events-calendar/the-events-calendar.php';
+		return 'events-manager/events-manager.php';
 	}
 
 	/**
@@ -51,15 +49,6 @@ class Events_Manager implements Event_Plugin {
 		return 'wp-admin/edit.php?post_type=event&page=events-manager-options#general';
 	}
 
-	/**
-	 * Returns the ActivityPub transformer class.
-	 *
-	 * @return string
-	 */
-	public static function get_activitypub_transformer_class_name(): string {
-		return 'GatherPress';
-	}
-
 	/**
 	 * Returns the taxonomy used for the plugin's event categories.
 	 *
diff --git a/includes/plugins/class-gatherpress.php b/includes/plugins/class-gatherpress.php
index 670916d..4754960 100644
--- a/includes/plugins/class-gatherpress.php
+++ b/includes/plugins/class-gatherpress.php
@@ -14,13 +14,6 @@ namespace Activitypub_Event_Extensions\Plugins;
 // Exit if accessed directly.
 defined( 'ABSPATH' ) || exit; // @codeCoverageIgnore
 
-require_once __DIR__ . '/interface-event-plugin.php';
-
-use Activitypub_Event_Extensions\Plugins\Event_Plugin;
-use GatherPress\Core\Event;
-use GatherPress\Core\Topic;
-use GatherPress\Core\Utility;
-
 /**
  * Interface for a supported event plugin.
  *
@@ -28,14 +21,14 @@ use GatherPress\Core\Utility;
  *
  * @since 1.0.0
  */
-class Gatherpress implements Event_Plugin {
+final class GatherPress extends Event_Plugin {
 	/**
 	 * Returns the full plugin file.
 	 *
 	 * @return string
 	 */
 	public static function get_plugin_file(): string {
-		return 'the-events-calendar/the-events-calendar.php';
+		return 'gatherpress/gatherpress.php';
 	}
 
 	/**
@@ -44,7 +37,7 @@ class Gatherpress implements Event_Plugin {
 	 * @return string
 	 */
 	public static function get_post_type(): string {
-		return Event::POST_TYPE;
+		return class_exists( '\GatherPress\Core\Event' ) ? \GatherPress\Core\Event::POST_TYPE : 'gatherpress_event';
 	}
 
 	/**
@@ -53,7 +46,7 @@ class Gatherpress implements Event_Plugin {
 	 * @return string The settings page url.
 	 */
 	public static function get_settings_page(): string {
-		return Utility::prefix_key( 'general' );
+		return class_exists( '\GatherPress\Core\Utility' ) ? \GatherPress\Core\Utility::prefix_key( 'general' ) : 'gatherpress_general';
 	}
 
 	/**
@@ -71,6 +64,6 @@ class Gatherpress implements Event_Plugin {
 	 * @return string
 	 */
 	public static function get_taxonomy(): string {
-		return Topic::TAXONOMY;
+		return class_exists( '\GatherPress\Core\Topic' ) ? \GatherPress\Core\Topic::TAXONOMY : 'gatherpress_topic';
 	}
 }
diff --git a/includes/plugins/class-the-events-calendar.php b/includes/plugins/class-the-events-calendar.php
index e48505d..21e4c69 100644
--- a/includes/plugins/class-the-events-calendar.php
+++ b/includes/plugins/class-the-events-calendar.php
@@ -14,10 +14,6 @@ namespace Activitypub_Event_Extensions\Plugins;
 // Exit if accessed directly.
 defined( 'ABSPATH' ) || exit; // @codeCoverageIgnore
 
-require_once __DIR__ . '/interface-event-plugin.php';
-
-use Activitypub_Event_Extensions\Plugins\Event_Plugin;
-
 /**
  * Interface for a supported event plugin.
  *
@@ -25,7 +21,7 @@ use Activitypub_Event_Extensions\Plugins\Event_Plugin;
  *
  * @since 1.0.0
  */
-class The_Events_Calendar implements Event_plugin {
+final class The_Events_Calendar extends Event_plugin {
 	/**
 	 * Returns the full plugin file.
 	 *
@@ -41,11 +37,9 @@ class The_Events_Calendar implements Event_plugin {
 	 * @return string
 	 */
 	public static function get_post_type(): string {
-		return \Tribe__Events__Main::POSTTYPE;
+		return class_exists( '\Tribe__Events__Main' ) ? \Tribe__Events__Main::POSTTYPE : 'tribe_event';
 	}
 
-	const POST_TYPE = class_exists( 'Tribe__Events__Main' ) ? \Tribe__Events__Main::POSTTYPE : 'tribe_event';
-
 	/**
 	 * Returns the ID of the main settings page of the plugin.
 	 *
@@ -56,21 +50,12 @@ class The_Events_Calendar implements Event_plugin {
 		return 'edit.php?post_type=tribe_events&page=tec-events-settings';
 	}
 
-	/**
-	 * Returns the ActivityPub transformer class.
-	 *
-	 * @return string
-	 */
-	public static function get_activitypub_transformer_class_name(): string {
-		return 'Tribe';
-	}
-
 	/**
 	 * Returns the taxonomy used for the plugin's event categories.
 	 *
 	 * @return string
 	 */
 	public static function get_taxonomy(): string {
-		return Tribe__Events__Main::TAXONOMY;
+		return class_exists( '\Tribe__Events__Main' ) ? \Tribe__Events__Main::TAXONOMY : 'tribe_events_cat';
 	}
 }
diff --git a/includes/plugins/class-vs-event-list.php b/includes/plugins/class-vs-event-list.php
index e5bae52..ff96a47 100644
--- a/includes/plugins/class-vs-event-list.php
+++ b/includes/plugins/class-vs-event-list.php
@@ -12,11 +12,11 @@
 
 namespace Activitypub_Event_Extensions\Plugins;
 
+use Activitypub_Event_Extensions\Event_Plugins;
+
 // Exit if accessed directly.
 defined( 'ABSPATH' ) || exit; // @codeCoverageIgnore
 
-require_once __DIR__ . '/interface-event-plugin.php';
-
 /**
  * Interface for a supported event plugin.
  *
@@ -24,7 +24,7 @@ require_once __DIR__ . '/interface-event-plugin.php';
  *
  * @since 1.0.0
  */
-class VS_Event_List implements Event_Plugin {
+final class VS_Event_List extends Event_Plugin {
 	/**
 	 * Returns the full plugin file.
 	 *
diff --git a/includes/plugins/interface-event-plugin.php b/includes/plugins/interface-event-plugin.php
deleted file mode 100644
index c4859e5..0000000
--- a/includes/plugins/interface-event-plugin.php
+++ /dev/null
@@ -1,58 +0,0 @@
-<?php
-/**
- * Interface for defining supported Event Plugins.
- *
- * Basic information that each supported event needs for this plugin to work.
- *
- * @package Activitypub_Event_Extensions
- * @since 1.0.0
- */
-
-namespace Activitypub_Event_Extensions\Plugins;
-
-// Exit if accessed directly.
-defined( 'ABSPATH' ) || exit; // @codeCoverageIgnore
-
-/**
- * Interface for a supported event plugin.
- *
- * This interface defines which information is necessary for a supported event plugin.
- *
- * @since 1.0.0
- */
-interface Event_Plugin {
-	/**
-	 * Returns the full plugin file.
-	 *
-	 * @return string
-	 */
-	public static function get_plugin_file(): string;
-
-	/**
-	 * Returns the event post type of the plugin.
-	 *
-	 * @return string
-	 */
-	public static function get_post_type(): string;
-
-	/**
-	 * Returns the ID of the main settings page of the plugin.
-	 *
-	 * @return string The settings page url.
-	 */
-	public static function get_settings_page(): string;
-
-	/**
-	 * Returns the ActivityPub transformer class.
-	 *
-	 * @return string
-	 */
-	public static function get_activitypub_transformer_class_name(): string;
-
-	/**
-	 * Returns the taxonomy used for the plugin's event categories.
-	 *
-	 * @return string
-	 */
-	public static function get_taxonomy(): string;
-}
diff --git a/templates/settings.php b/templates/settings.php
index 34b6bb3..aab3640 100644
--- a/templates/settings.php
+++ b/templates/settings.php
@@ -93,7 +93,7 @@ $current_category_mapping        = \get_option( 'activitypub_event_extensions_ev
 			</table>
 		</div>
 
-		<?php if( ! empty( $event_terms ) ) : ?>
+		<?php if ( ! empty( $event_terms ) ) : ?>
 		<div class="box">
 			<h2> <?php esc_html_e( 'Advanced Event Category Settings', 'activitypub-event-extensions' ); ?> </h2>
 			<p> <?php esc_html_e( 'Take more control by adjusting how your event categories are mapped to the basic category set used in ActivityPub. This option lets you override the default selection above, ensuring more accurate categorization and better visibility for your events.' ); ?> </p>