Yikes! Nothing like jumping in with both feet.
I'm comfortable, in social situations, around people who drink but, I think, a big part of that is due to the fact that all my friends know I'm an alcoholic in recovery. They're very supportive, if not downright protective. You're going to be in a completely different atmosphere and with only a couple days of dry time.
All I can offer is that you have a plan to make a hasty withdrawal if you get antsy and think you might drink. Please don't sabotage yourself so early in your efforts.