I was there on 2 days last year and yesterday, 8/6/11. It is the most entertaining event for bikers, walkers, rollerbladers, joggers, etc. There are various exercise shows, demos, vendor tents, sweepstakes, etc. going on and you can traverse the Park Ave from Brroklyn Bridge up to 92nd street or so (check the website) without any motor vehicles on the road. It is a feast for the eyes to watch all these different types of bikes at the same time. I saw a Madsen carrying a child, a recumbent tandem, and lots of Dahons and other folding bikes. It is a lot of fun.