5/20/2012 4:55 PM Chicago. Protesters, most of whom marched from the Grant Park, gathered @ Michigan Ave. & Cermak Rd.Less than half a mile east 2012 NATO summit is under way @ McCormick Convention Center. The protest permit expired at 4.00 PM. Despite the seemingly peaceful atmosphere the riot police reinforcements are called in to the front of the protest. Some of the protesters react by chanting: "You're sexy, you're cute, take off your riot suit." But will the tension ease?