Hey Drew,
Welcome and thank you for reaching out 🙂
To edit the submit event form, our Themer’s Guide does a great job of explaining how to create and save custom templates. This is another helpful resource for setting required fields on the Community Events submit event form.
The file you’ll need to edit is /the-events-calendar-community-events/src/views/community/edit-event.php.
Be sure to save with the following folder structure to avoid losing customizations when updating the Community Events plugin: [your-theme]/tribe-events/community/edit-event.php.
Let me know how it goes and best of luck. Cheers!