Remove Add Files by event create

How  i can remove  the field

Add files  by  create  Events

In modules\boonex\events\classes\BxEventsFormAdd.php

Find :      

$this->processMembershipChecksForMediaUploads ($aCustomForm['inputs']);

Just above, Add :

unset($aCustomForm['inputs']['header_files']);
unset($aCustomForm['inputs']['files_choice']);
unset($aCustomForm['inputs']['files_upload']);

Thanks for this modzzz (old topic but worth it)