Why not look at this trip as ONE experiment - "let's see if I can get through an event like this sober, just this once?"
I bet you'll LOVE it, and the feeling of accomplishment will make you feel on top of the world. Bring some things to do while everyone is sitting around drinking. I recommend ordering an adult paint by numbers kit on Amazon. It gives you something to do with your hands while everyone else is holding a beer, but it's not so distracting that you won't be able to engage in conversation - plus, it will give you the brain relaxation you're probably looking for from booze.
Just this once, try this trip sober. I can't wait to hear how it goes!