Ladies and gentlemen, clowns will descend on Chicago this weekend. Let the nightmares begin! Top political figures and military officials from across the world will be in the city this weekend for the 2012 NATO Summit, and the war in Afghanistan figures to be the top topic. It’s the kind of event that draws protesters as commonly as a Justin Bieber concert draws screaming teenage girls. A group called Clown Bloq has cast itself into the mix in Chicago, announcing in a “communique” that it will protest NATO’s military actions, among other things. From their site: Clown Bloq is a…