Dozens of vendors, guests, and panels are spread over two days at this cycle celebration. Look for appearances by former pro racer Axel Merckx, historian David V. Herlihy, author/humorist Joe Kurmaskie, and author/blogger BikeSnobNYC (1:20 and 4:15 p.m. Sat., 12:30 p.m. Sun.). The latter loves to document the conflict between tattooed fixie rider and bearded dorks on recumbents. Are they even members of the same tribe? Such questions of taxonomy and mutual scorn have made BikeSnob (aka Eben Weiss) indispensable, hilarious reading since 2007 (Lance Armstrong is a fan); and he’s lately compiled his observations into a book simply known as Bike Snob. Because, really, all cyclists are snobs—all convinced that his or her mode of transportation is superior to others on the Burke-Gilman Trail. Weiss makes fun of us all because he’s one of us all: former messenger, weary Brooklyn bicycle commuter, weekend racer. Every stereotype comes in for mockery, and he makes important points about safety, helmets, and bike lanes. “Don’t ride next to cars at intersections,” he writes. “Think of cars as affectionate cats that are going to try to rub themselves against you.” BRIAN MILLER

Sat., March 12, 9 a.m.-6 p.m.; Sun., March 13, 10 a.m.-4 p.m., 2011