Resolving cheating issues, my husband's staff night out is at the hotel he used to take her! Would you go?

My husband had an affair and left me for her. 3 weeks later he came back saying it was the worst mistake he had ever made. After a lot of pain and heartache our marriage is back on track. Then this spanner gets thrown into the works! His Christmas staff night out has been booked at the hotel he went to with her. Obviously it wasn't done on purpose and he was horrified when he realised the venue. We are expected to attend as a couple. I can't face it. What would you do?