Howlies seaace11, that's a strange bug indeed. Could you provide any screenshots of the error you're experiencing?
Viewing post in Janus halloween event bug
Somehow i was able to get it. What i did the first time is I skipped straight to the Halloween event. The second time i did some days in the planner before going to the Halloween event. Not sure if that made a difference. Also not sure how old the save was. The save point i used was when wolfstar is getting the calls from his friends. The save point could be months if not a year or more old.