Hey girl! Have faith in yourself - if you've done it before, you can do it again.
I also had an issue with drinking... alcohol is one of my biggest weaknesses. It helped to drink drinks that weren't super tasty; for example, vodka with soda water and lime. This would slow down my consumption and help me be more mindful (hey, I don't need to have 5 beers!). Also, if you're more sober than everyone else, you can remember more of what they say, and you won't wake up the next day with a bad hangover. Plus, you avoid the dreaded "drunchies."
I guess I'd say if you really feel like you want to drink, try to keep it to one or two. Otherwise, not drinking at all is a good practice to have (order something non-alcoholic). Everyone else will be tipsy so they won't even notice... just let them do all the talking.