Auswahl:
{!! Form::model($event, ['route' => ['update-advertisement', $event->id], 'enctype' => 'multipart/form-data', 'accept-charset' => 'UTF-8']) !!}
{!! Form::select('filiale[]', $filialen, $event->filialen, ['class' => 'form-control advertise-filiale', 'lang' => 'de', 'multiple' => 'multiple']) !!}
{!! Form::close() !!}