public function doRegister($data, WaitingListRegistrationForm $form)
    {
        $form->saveInto($registration = WaitingListRegistration::create());
        $registration->EventID = $this->getController()->ID;
        $this->getController()->WaitingList()->add($registration);
        $this->getController()->redirect($this->getController()->Link('?waitinglist=1'));
    }