I don't think a poly meet up would be the same. As you say, everyone attending is poly or is curious about poly.
Novemberrain, you make a good point. I am 28. All my friends - poly and mono - seem to exclusively date online. I know a few that have been set up by friends, but no one that is dating a partner they asked out randomly.
And yeah, I know I am likely to get a bias response on a poly board, but figured it was worth seeing what kind of ideas and experiences were out there