show latest comment using custom placeholder

add_filter('em_event_output_placeholder','my_em_placeholder_mod_comment',1,3);
function my_em_placeholder_mod_comment($replace, $EM_Event, $result){
	if ( $result == '#_EVENTCOMMENT' ) {
		$replace = 'n/a';
		$args = array( 'post_id' => $EM_Event->post_id, 'count' => false, 'comment_content' => true, 'orderby' => 'comment_date_gmt', 'number' => 1 );
		$comments = get_comments($args);
		foreach($comments as $comment) :
			$replace = $comment->comment_content;
		endforeach;
	}
	return $replace;
}