public function render_events_joined()
 {
     if (is_user_logged_in()) {
         require_once WPPR_PLUGIN_DIR . '/models/event-model.php';
         $model = new Event_Model();
         $events = array();
         $user_id = get_current_user_id();
         $events_joined = $model->get_events_joined($user_id);
         foreach ($events_joined as $event) {
             $events[] = $event->event_id;
         }
         $this->events_joined = $events;
         require_once dirname(__DIR__) . '/views/events-joined.php';
     } else {
         //redirect to login page
         PR_Membership::pr_redirect(home_url());
     }
 }