public function form_render($form)
 {
     foreach ($form['fields'] as $i => &$field) {
         if ($field->id == 1) {
             $field->choices = array_map(function ($event) {
                 return array('value' => $event->ID, 'text' => $event->post_title);
             }, get_user_attended_events_without_feedback());
         }
     }
     return $form;
 }
 public function populate_user_events_field($form)
 {
     foreach ($form['fields'] as &$field) {
         if ($field['label'] == 'Event') {
             $field['choices'] = array_map(function ($post) {
                 return array('text' => $post->post_title, 'value' => $post->ID);
             }, get_user_attended_events_without_feedback());
         }
     }
     return $form;
 }