Hi James!
Thanks for reaching out to us!
First, let me apologise for the delay in getting back to you. It seems your post has fallen out of our radar.
We know some users tried to get ACF fields to be usable in the community submission form, but it seems to be a bit tricky.
It should be possible to create such customization, even without using ACF, but would definitely involve custom coding. For customizations like these, we generally suggest you try our plugins and perform the necessary tests to make sure it works as expected.
We have a pretty good refund policy so you can always ask for a full refund within 30-day of purchase > https://theeventscalendar.com/knowledgebase/refund-policy/.
I hope that helps. Let me know if any follow up questions.
Best,
Victor