I can't drink at all when I am flaring - but even when I am not (like right now) I realized I can't have more than one drink at a time, and seem to do better with wine, etc. I read online that the more sugary the alcoholic drink, sometimes the more it affects someone with crohns (recent study). But who knows - I think it is pretty individual! I do notice after I drink even one drink I often have some blood the next day in my BM. I have been feeling so well that I pushed it last weekend - ate some chinese food and then late at night had some onion rings and a martini (haven't had a martini in years) - woke up in the middle of the night vomiting
I was so mad that I couldn't even handle one martini!! (Although it makes sense because a martini is usually equivalent to a couple drinks or more). Basically, like everyone said, listen to your own body - and I understand the desire to participate with your friends - just be a bit cautious!