Did you consider wearing an N95 and washing hands thoroughly upon departure

Not OP, but if the main attraction of the “holiday event” is a meal, it’s not like you can wear an N95 mask to eat. I suppose it’d be an option to make a quick appearance and then bow out before the meal, but it sounds like OP’s family’s would just be assholes to OP if OP showed up just to leave early (and was also assholes when OP declined to show up entirely.)