Hi northwoods,church! Welcome to the forums. 🙂
That’s an interesting question. It would certainly be neat to make additional fields conditional based on the event/category/tag/view/etc. being used, but unfortunately that’s not something available right out of the box. I wonder if you you have better luck integrating Advanced Custom Fields with The Events Calendar since it provides a deeper level of logic to match specific fields to specific posts.
I really like the way you’re thinking–if you have a moment, I’d it if you posted your idea on our UserVoice forum. We track new feature requests there and I could see how others might find that handy as well.
Cheers!
Geoff