Alcohol & breastfeeding

My LO is just about a month old and is currently bottle feeding due to severe tongue tie which will be getting clipped next week then I plan to try and exclusively breastfeed. I am going to a concert towards the end of the month & to be completely honest I plan on getting drunk. Baby will be with grandparents and I rarely go out. If I do it’s maybe twice a year at the most so I wanna have some fun. Anyways back to the point would I need to pump and dump if I wanted to breastfeed or how many days should I wait to be safe? Please don’t be rude. Ima a FTM and PP depression is kicking my ass