I attended the Chicago event. There were a couple hundred people, short speeches for maybe half an hour in Daley Plaza, then walking a few blocks to Millennium Park (several chants, of which "NSA has TMI" was the most enthusiastic). There was one idiot yelling at the cops and eventually ticketed for writing on the sidewalk. Everyone else was decent, but the rhetoric too frequently strayed from asking for implementable legislation like judicial transparency, actual oversight, and the extent to which terrorism can be used to justify secrecy and the compromise of civil liberties to Snowden (which I consider relevant only insofar as his treatment will affect future whistleblowers and that the human story may cause more people to learn what he leaked) and further to the OWS agenda.