Rallygoers will ride from RFK Stadium to the National Mall on Sunday. The demonstration is set to begin at noon.
Rolling to Remember, organized by AMVETS, is meant to draw awareness to service members missing in action and to the ongoing mental health crisis among veterans.
The organizers said they are expecting up to 100,000 bikes and up to 150,000 attendees.
The following roads will be closed 4 a.m. to 5 p.m. on Sunday:
Eastbound Independence Avenue Southeast, from 19th Street Southeast to the entrance of RFK Lot 8.
East Capitol Street Southeast, from 19th to 22nd streets Southeast.
22nd Street Southeast, from C Street Southeast to Independence Avenue Southeast.