General search

Hi, is it possible to make events appear in the general wordpress search. I tried to include this function in my function.php file without success. Any clue?

function include_events_in_search($query) {
if (!is_admin() && $query->is_main_query() && $query->is_search()) {
$query->set('post_type', array('post', 'page', 'event'));}
return $query;}
add_filter('pre_get_posts', 'include_events_in_search');