I had to hostess a bridal shower after I got sober and some of the girls brought wine (my fav). It was a bit disconcerting at first, but then I realized how little they actually were drinking. Some of the girls had a few sips and that was it! wow.....
I think that day I realized alcohol is only OK in tiny, tiny amounts and it's a non-issue for most people. For 8-10% of the population though (that would be us!), there are no tiny amounts, just huge doses which become pure poison and destroy us. As I went through the party, I just imagined a skull and crossbones on those bottles - they might as well have been anti-freeze!
You'll be really busy, which will be good. Just keep your mind on being there as a service to others. It's normal to be nervous, but if you really feel you're going to have a hard time, find someone to be there with you and help you out. We'll be here thinking about you! :ghug3