You can prove this

Replace
if ( $noduration ) template_extract_block($template_event_view, 'duration_row');
echo template_eval($template_event_view, $params);
endtable();
with
if ( $noduration ) template_extract_block($template_event_view, 'duration_row');
echo template_eval($template_event_view, $params);
endtable();
global $mainframe;
$jcomments = $mainframe->getCfg('absolute_path') . '/components/com_jcomments/jcomments.php';
if (file_exists($jcomments)) {
require_once($jcomments);
echo JComments::showComments($event->extid, 'com_jcalpro', $event->title);
}