Event image required

Hi,

Yes, you can hook into the em_event_validate filter

e.g.

add_filter('em_event_save','em_event_filter_event_save', 1, 2);
function em_event_filter_event_save($result, $EM_Event){
 
 if ( empty($_REQUEST['em_event_image']) ) {
  $EM_Event->add_error('Some error message');
  $result = false;
 }
 
 return $result;
}

As for where to paste custom snippet – https://wp-events-plugin.com/tutorials/how-to-safely-add-php-code-to-wordpress/