I just try to listen to my gut..... I still turn down some invitations after several years' sober. The first few times I did go to an event where there would be alcohol, I did have some apprehension, but I found that I actually enjoyed myself much more being sober than I ever did while drinking.
I don't like being around drunks and I think I'd imagined that any drinking occasion would have a "bar atmosphere", but it really wasn't that way......most "normal" people are content with one or two drinks.