DV,
I don't know what to suggest to you about your relationship. I cannot fathom doing what she is doing for a partner who is struggling with early recovery.
I DO think you need to do whatever you need to do to be away from this crap this weekend. I agree with several of the post-ers here, that if she won't take the party elsewhere, you need to take YOU elsewhere. And you and your g/f need to have a long talk about this.
Do whatever it takes not to drink.