How to stay lean while drinking

Not sure if anyone is serious about maintain their leaness/bodyfat %

I got initiated into a frat this fall, I love having the friends and opportunities for moves constantly but it seems like the brothers are always constantly drinking 3-4x a week

I expected this but it tempts me as well however I have bodybuilding goals and I’m trying to lean bulk while keeping my abs

Anyone have tips to build muscle, stay lean, while actually enjoying the pros of being in a frat?