Vanessa Van Edwards recommends standing at the bar exit to catch people with fresh drinks. They're momentarily awkward and looking for interaction, so a simple opener like "What brings you here?" works. You become the first friendly face they see.
Chapters
My favorite place to stand is right as people exit the bar. So wherever the drinks are set up, it's that moment where someone turns around and faces the room with drink in hand that you are a social savior. They have just gotten their drink. They're turning around from just filling their drink with ice. If you are standing right there, you have a very easy opener. So what brings you here? How's the drink? Is the wine good? That moment is awkward for everyone. It doesn't matter how extroverted you are. If you are in a room where you don't know who you're gonna talk to next and you just had your filled drink, let me tell You there's panic. Someone might not look panicked, but they're like with their drink and they're like, who who who who who? Let it be you. So that's my favorite place to stand right as you'll exit the bar.