public function filter_admin_title( $admin_title, $unused_title ) {
		if ( ! empty( $_GET['event_id'] ) ) {
			$event       = get_post( $_GET['event_id'] );
			$admin_title = sprintf( __( '%s - Attendee list', 'event-tickets' ), $event->post_title );
		}

		return $admin_title;
	}