/**
  * Renders the activities inside a calendar... might be nicer to view
  * @param  [type] $start [description]
  * @param  [type] $end   [description]
  * @param  [type] $_     [description]
  * @return [type]        [description]
  */
 public function actionJsoncalendar($start = NULL, $end = NULL, $entity = NULL, $entity_id = NULL, $_ = NULL, $entityTitleField = NULL)
 {
     \Yii::$app->response->format = \yii\web\Response::FORMAT_JSON;
     if ($start = null) {
         $startObj = new DateTime();
         $start = $startObj->format('U');
     }
     $events = Activity::getCalendarActivities($start, $end, $entity, $entity_id, $entityTitleField);
     return $events;
 }