Marty,
In order to customize the event submission form, you’ll need to perform a template override of any of the Community Events views that you wish to change. Here’s how to do this:
1) Just create the following new directory structure in your theme directory: ‘/tribe-events/community’
2) After doing that, go to ‘wp-content/plugins/the-events-calendar-community-events/views/community/’ and copy over all files to the new directory you created in Step 1.
This should allow you to modify any of the Community View files and still keep your changes when there’s an update to the plugin.
Hope that helps, but let me know if you have further questions. Thanks!