Make sure the hotfix downloaded when you started the game. Go into the Options menu and it’ll give you a popup if you’re missing the hotfix. If you’re missing the hotfix, the event will appear as inactive.
If you don’t see the pumpkins and stuff once you’re at the screen where you see your currently selected character, the hotfix isn’t on. If that’s the case, just wait until the appear (or back up one level and redo).
This fixed mine too. Thanks!