As for the velodrome "closing"...Ceya is spot on. It's a New York City public park so you can, in theory, ride whenever there has not been a reservation made for private training or events. There are no lights for nighttime riding though. Oh and a helmet, drop bars and fixed gear are technically required. (Although I have literally ridden with a homeless guy riding clockwise, doing S turns up and down the banks on a duct-taped mountain bike...but that's why I love NYC cycling...this sh*t's for EVERYBODY! ) Not too many restrictions other than that. There is a 4' gate you might have to hop, but at least there aren't burnt out Oldsmobiles in the infield anymore.