I really like what mecanix said. It doesn't have to be all fun. Just get through it. Fun will follow. If the cooking will be a trigger, maybe cater the meal this year. Have everyone bring a dish. Make sure you have something interesting and non alcoholic to drink.
Well done on 8 weeks. There's a lot of anxiety around at this time of year but you can get through it. I quit before Christmas. I focused on my kids.