public function WaitingListRegistrationForm()
    {
        if (
            $this->owner->Tickets()->count()
            && $this->owner->getTicketsSoldOut()
            && !$this->owner->getEventExpired()
        ) {
            return new WaitingListRegistrationForm($this->owner, 'WaitingListRegistrationForm');
        } else {
            return null;
        }
    }
public function WaitingListRegistrationForm()
    {
        if (
            $this->owner->Tickets()->count()
            && $this->owner->getTicketsSoldOut()
            && !$this->owner->getEventExpired()
        ) {
            return new WaitingListRegistrationForm($this->owner, 'WaitingListRegistrationForm');
        } else {
            return null;
        }
    }
public function WaitingListRegistrationForm ( ) { if ( $ this -> owner -> Tickets ( ) -> count ( ) && $ this -> owner -> getTicketsSoldOut ( ) && ! $ this -> owner -> getEventExpired ( ) ) { return new WaitingListRegistrationForm ( $ this -> owner , 'WaitingListRegistrationForm' ) ; } else { return null ; } }
show the waiting list form when the event is sold out

@return WaitingListRegistrationForm
show the waiting list form when the event is sold out