I really don't like clubs, so I rarely have to be in that situation, when I do go I usually drink gin tonics, it's got some sugar from the tonic, but it's not that bad (specially compared to other mixers like coke or redbull). If you like whisky you could have that on the rocks, it would be perfect, the only problem for me is that I'm probably the only venezuelan in the world that doesn't like whisky, lol.
Now, most of my social activity is in bars or going out for dinner, I rely heavily on wine, which I love and I think it's good for you even though it's not really paleo. I do have a few beers every now and then, I love beer, but I don't have even half as many as I did before going paleo. My attitude towards social drinking is that Ill have enough to enjoy myself and have a good time and I count on being almost 100% paleo for the rest of the time to lessen the damage.
I only go out once or twice a week at most, going out 4 times a week and drinking accordingly would be completely different, I don't see myself staying healthy and continuing my weightloss in those conditions, best case scenario, it would stop my progress but I wouldn't gain anything back.
However, sometimes you just have to forget about it and have a good time, a few weeks ago we threw a party for a friend that was going back to her home in Mexico, it was a special occasion, so I just drank whatever I wanted and had an awesome time (and an awesome hangover the next day too, hahaha).