“Ride at your own risk!” cautions the Facebook page for Fluff’s fourth annual NYC Big Wheel Race. Indeed, though the competitors in today’s race might be dressed in ridiculous superhero costumes and riding kiddie bikes, they’ll all be serious about speed—sometimes going as fast as 30 miles per hour downhill. If you want to join the big event, anyone with a Big Wheel, trike, or homemade contraption (with a seat no higher than 12 inches above the ground) can enter, and, of course, wearing helmets and other protective gear is highly recommended. The silliness concludes with an enchilada dinner.

Sat., Oct. 8, 3 p.m., 2011