Um, there's a lot of fixies around here. As far as groups/whatever I don't ride with too many people. But events like the Stupor Bowl and the Drunken NE Bar Bike Tours draw a lot of people. There were something like 3-400 people on the last drunk tour I think, but that was all kinds of bikes. Seriously, I doubt there was a kind of bike that you COULDN'T find there...