I agree this was clunky and wasn't what I saw in the last con. In the last FGCon, the user IDs were visible when you viewed the event. No gymnastics. If you could pull up that revision or the change history, you might be able to spot it and port it back in.
I believe they appeared between in the event description between the Booked/Pending/Available info and the description of the game. Wish I had an old screenshot.