What a friend of mine always did after going out for a date night that included alcohol is pump from both sides and dump the milk to be sure that the baby didn’t receive any ill effects of alcohol.

You are supposed to wait 1-2 hours per drink. One drink being 1 glass of wine/1 bottle of beer/ 1oz. of liquor.
I have had a glass of wine & breast fed. Nothing happened. Sometimes a baby may get gassy (beer), but that can happen when you eat certain foods, too.
You never have to pump & dump. The ‘bad’ milk will still be in your system. I would think drinking water in between beverages would help. That’s what I’d do.
One time, I went out & drank more then I planned on…When I came home, my baby was screaming because I was there, but I wasn’t giving my boob. She refused the bottle, so I breast fed. She was fine. She wasn’t cranky or anything.