There is a Critical Mass ride in San Francisco every first Friday of the month, I think it is. Apparently makes for a real traffic disaster in the city. I've never seen it or participated in it. I don't know if I think it's a good idea. Might just make more enemies than friends. My husband has been riding for years and says it seems that there is a contingent of drivers who enjoy creating problems for cyclists. I wonder if these demonstrations help create awareness or just piss people off.