Which template should I update to add more info to the message that an event has been submitted?
There isnt anything to indicate it needs to be approved before it will be seen publicly.
If the setting are such that it needs to be approved, can this be added in a future release?
Sorry to say there’s no separate template for that. The most straight forward solution is to redirect users after event submit, please check out this Knowledge base article covering that: Redirect to different URL after event submission.
If you still think we should address this any another way, you are welcome to suggest that as feature at our Uservoice page.
Please let me know if this works for you,
Best,
Nico