They have organised something for either a Friday/Saturday night for every weekend in March. Of course I can say no, but I've felt obliged to say yes to it all. I have nothing else planned but I do sometimes like a weekend of no plans and fri/sat night on the sofa, type of thing. If I said no then they should want to know why I couldn't come. 1 person in the group, who is a bit of a ring-leader (said in a nice way) wouldn't accept "no, just because I don't want to' as an excuse. I work 50 hours a week, I am exhausted by the weekend.