Wanted to do the same, so I copied from wp-content/plugins/events-manager/templates/forms/event-editor.php, modified it, and saved it to wp-content/themes/bare-responsive/plugins/events-manager/templates/event-editor.php, but WP doesn’t appear to get my updated file.
Did I save the updated file in the wrong location?
My page is at: https://3wayracing.com/?page_id=1198
