well what i do when i go out drinking at night is come home and stand by my water cooler and drink till im about to puke. Then piss then sleep.
Look you need to enjoy life while you have it. So if you enjoy going out and and getting drunk on the weekends do it. I do. You will still grow muscle. The amout it will hinder your gains is most likely very miniscule. Last summer i Put on more muscle naturally than i knew what to do with and i was drinkin 3 times a week. So go have fun. The only thing i avoid is drinking and working out in the same day. I like to wait one day after a workout until i throw some back.