Bike DC Saturday 9/27
"Bike DC is a noncompetitive, community bike ride through 17 car-free miles of Washington, DC. The route is designed to be enjoyed by experienced riders, novices and families. So that participants may fully appreciate the adventure of cycling on car free city streets, Bike DC is a ride, not a race."
It appears, from the below bike route map, the Bike DC route will include Kingman Park and the Anacostia River Trail around RFK Stadium and parking lots. Streets along the route and cross streets will be closed (in intervals) from 8am - 12pm.
Disclosure: above information was extracted from from Bike DC website