public static function add_event_properties( \WP_Post $event ) {
		// Return when YouTube is not the source.
		if ( 'youtube' !== $event->virtual_video_source ) {
			return $event;
		}

		// Get the saved values since the source is YouTube.
		foreach ( self::$fields as $field_name ) {
			$prefix_name = self::get_prefix( $field_name );
			$value = self::get_meta_field( $prefix_name, $event );
			$event->{$prefix_name} = $value;
		}

		// Enforce this is a virtual event.
		$event->virtual                  = true;
		$event->virtual_meeting          = true;
		$event->virtual_meeting_provider = tribe( YouTube_Provider::class )->get_slug();

		// Set virtual url to null if YouTube is connected to the event.
		$event->virtual_url = null;

		return $event;
	}