Drinking while breastfeeding

So I’m 2.5 months pp and i exclusively breastfeed. My friend is having a birthday party at the end of the month and she wants me to come and drink with her since it’s so long(my sister will be taking my daughter overnight . I’m nervous though since i breastfeed . I was planning on pumping all next week and storing some for when I’m gone and so also 24 hrs after i drink i can just feed her off the bottle and the pump and dump but I’ve also heard that’s not necessary. One of my friend breastfeeds and she said as long as i feed my baby before i go, it would be out of my system by the morning ( she drinks sometimes after she puts her baby to sleep because her baby sleeps through the night without a midnight feeding just like my baby does ) I’m just looking for some advice though because of course first and foremost I’d like to make sure my baby is safe , then comes fun .