Hi.
I will add this thread to our internal bug: Community Events > Not All Fields remain populated after an error
I’ll mark this ticket as Pending Fix, which means this thread should receive a reply once the applicable fix has been released. I cannot guarantee when it will be fixed as it’s in the development team’s hands now. They need to assign it, code it, test it, and schedule it for release.
The best I can say is that it should be part of the next 1 or 2 upcoming releases.
I apologize for this issue and appreciate your understanding and patience.