From PSA 301 via the MVSNA listserv:
The parade hours will be Saturday, May 29, 2010 from 10am which will be the assembly time, and start at 12 Noon to 3pm which will be the disbanding time.
The route is as follows:
The parade will form at 6th and M Street NW and will proceed over the following route: North on 6th Street to S Street, West on S Street to 13th Street to Logan Circle, Southeast around Logan Circle to P Street, East on P Street to 7th Street, South on 7th Street to M Street, East on M Street to 6th where participants will disband.
Enjoy the parade, but if you got somewhere to go, don't do it during the parade unless you're on foot or bike.