Good to hear you have a plan. That's what I do. Nothing is more important to me than staying sober. If I have to leave an event because something happens, then I will. I'm just in the mindset right now that I don't drink alcohol. I've had to confront family and sets of friends who are definitely surprised by it, which tells me I'm on the right track (people associate me with drinking).
If you feel like it's getting to be a bit much, then just leave. Make sure your boss knows when you were there. They'll be so liquored up, people will have a hard time recalling when you left.
From my drinking days, people that did that were forgiven easily as I went back to being obnoxious and getting loaded (thinking about myself).
Good luck!