Very little. My boyfriend's wife and her boyfriends are it, and I very rarely socialize with them other then to say hi if we run into each other at his home.
I used to go to the local poly potluck/meeting occasionally, but it's been years since I've done that. None of my friends/family are poly, and Fly (live-in boyfriend) doesn't really do sustained relationships. He's invited his playmates over once in a while if we're having a big BBQ or house party, but I don't always know who he's sleeping/slept with, and most of them identify as single or open, not poly.
Online is pretty much it, and "online poly" for me consists of this forum