CBS news estimated the rally of Glenn Becks on August 28, 2010 at 87,000. By looking at the ariel picture of that event, the National Park Service estimates between 300,000 and 325,000 people attended the Glenn Beck rally.
GLENN BECKS RALLY in AUGUST 28, 2010
Base on permits for 60,000 people for this rally of Jon Stewart and Colbert (Rally to Restore Sanity and/or Fear), the rally is ordered to have 500 port-a-potties for the event, which are recommended at a ratio of one for every 300 people. Using those figures, the estimated crowd would have been 150,000.
JON STEWART/STEPHEN COLBERT RALLY TO RESTORE SANITY
Besides, the Jon Stewart/Colbert rally was a free concert with some famous notables. Who wouldn't want to go see a free concert? We are American, aren't we? When there is a free concert, you can see a huge gathering.
Read story: A comparison of 'Rally to Restore Sanity' attendance to previous National Mall gatherings