I've read about this elsewehere here but can't find it right now. The fix/workaround has to do with talking to Zevlor before starting the celebration if I remember correctly. Are you still able to reload form before the celebration?
Edit: Found it: https://forums.larian.com/ubbthread...g+celebration&Search=true#Post927817

Last edited by Bomor; 21/12/23 03:55 PM.