public function addActivity($name, $organizationId)
    {
        $model = new \MUtil_Model_TableModel('gems__agenda_activities');
        \Gems_Model::setChangeFieldsByPrefix($model, 'gaa');

        $values = array(
            'gaa_name'            => $name,
            'gaa_id_organization' => $organizationId,
            'gaa_match_to'        => $name,
            'gaa_active'          => 1,
            'gaa_filter'          => 0,
        );

        $result = $model->save($values);

        $this->cache->clean(\Zend_Cache::CLEANING_MODE_MATCHING_ANY_TAG, array('activity', 'activities'));

        return $result;
    }