/**
  * Checks whether the registration for this event has started.
  *
  * @param tx_seminars_seminar $event the event to check the registration for
  *
  * @return bool TRUE if registration for this event already has started, FALSE otherwise
  */
 public function registrationHasStarted(tx_seminars_seminar $event)
 {
     if (!$event->hasRegistrationBegin()) {
         return TRUE;
     }
     return $GLOBALS['SIM_EXEC_TIME'] >= $event->getRegistrationBeginAsUnixTimestamp();
 }