Haven't seen any. According to Beck's rally page 17th St. will be closed at the Mall:
Road Closures Several roads around the Lincoln Memorial and the National Mall will be closed, including 17th Street between Constitution Ave and Independence Ave, and Independence Ave from 17th Street to 23rd Street.
66 posted on 08/27/2010 8:12:43 AM PDT by kristinn
(Since Jul 31, 1998)