I've been having this issue since the same patch date. Deleting the holiday/planning an event on a day with no holiday still works fine, but before the patch it was possible to plan goaled events even on holidays or when there were the Get Famous events. I know a long while ago it wasn't possible to have a goaled event during holidays, but that changed I think around the time of Wedding Stories?
Not sure if it was intentionally patched back out, but hopefully they allow it again😅 Sometimes you just want to have a goaled incognito party on Spooky Day, you know?
