My group of friends have been close for about 5-6 years now. We all play video games, D&amp;D, hang out and occasionally party together.  A member of our group has his birthday coming up soon and will be turning 21. Now we're in a province where the drinking age is 18 and from 18 up through 19 we partied and went to the bar all the time. Now that we're all turning 21 this year we are pretty much done with clubs. It's loud, boring and way too expensive for the majority of the group. Except the birthday boy. He still goes out clubbing almost every weekend, and for his birthday he wants to do have a small get together and then go get wasted at the bar as per usual. He's a good friend, we want him to have fun, but the vast majority of us don't like to, or don't have the money to go out to the bar (some are both). 

We have a friend in from another country too, and he doesn't wanna go out. The birthday boy wouldn't be alone , he's inviting some other people and his girlfriend who loves going out with him. It's his birthday and we rarely get to see each other with school and work schedules. I feel like it may be rude to him if we all stayed at the house (it's not his the first half is at, it's one of our friends) while he went out on his birthday. But he knows we don't like to go out clubbing, and we really, really don't want want.

WIBTA if I stayed and didn't go with him? 