/**
  * constructor
  */
 public function __construct()
 {
     $this->add_hooks();
     // Load multisite defaults
     if (is_multisite()) {
         $tribe_events_mu_defaults = array();
         if (file_exists(WP_CONTENT_DIR . '/tribe-events-mu-defaults.php')) {
             require_once WP_CONTENT_DIR . '/tribe-events-mu-defaults.php';
         }
         self::$tribe_events_mu_defaults = apply_filters('tribe_events_mu_defaults', $tribe_events_mu_defaults);
     }
 }