protected function AddNewInstance(DateRange $reservationDate)
 {
     if (!$this->InstanceStartsOnDate($reservationDate)) {
         Log::Debug('Adding instance for series %s on %s', $this->SeriesId(), $reservationDate);
         $newInstance = parent::AddNewInstance($reservationDate);
         $this->AddEvent(new InstanceAddedEvent($newInstance, $this));
     }
 }