protected function setDateListFor(\MUtil_Model_ModelAbstract $model, $fieldName, $source, $roundId, $language, $validAfter)
    {
        $dateOptions = $this->getDateOptionsFor($source, $roundId, $language, $validAfter);

        switch (count($dateOptions)) {
            case 0:
                $model->del($fieldName, 'label');
                break;
            case 1:
                $model->set($fieldName, 'elementClass', 'exhibitor');
                // Intentional fall through
            default:
                $model->set($fieldName, 'multiOptions', $dateOptions);
                break;
        }
    }