I handle myself decently imo at parties. Drinking isn't a part of my social strategy as I don't partake. Generally at parties I'm too focused on the people I'm talking to or having people around me enjoy themselves to give hard numeric metrics to my stutter. A lot of people you are encountering at parties are ashamed about something they are concealing about themselves as well. If there is one thing I've learned over time, that other people suffer from serious shame about something you'd likely consider minor in scope. It might feel counter-intuitive but being a closet stutter gives your stutter power over you. If anyone has a problem your stutter, they really aren't worth your time plain and simple. That includes people you just meet at a party. You have merit and you have worth, your stutter is only one part of you. If telling people you stutter is hard, just make it your goal to tell only at a party you stutter. You might actually want to tell everyone after that. It is so freeing to leave your stutter fear at the door.