public function edit_bulk_completion($form, $activities) {
        ob_start();
        $form->display();
        $formhtml = ob_get_contents();
        ob_end_clean();

        $data = (object)[
            'form' => $formhtml,
            'activities' => array_values($activities),
            'activitiescount' => count($activities),
        ];
        return parent::render_from_template('core_course/editbulkactivitycompletion', $data);
    }