We’ve all heard about the woes that the dismal economic situation has wrought upon the automotive industry and the once bustling city of Detroit. On September 5, Detropia, a documentary chronicling the rise and fall of the Motor City will be released in theaters, and already the buzz is building. New York Magazine has called the latest film by directors Heidi Ewing and Rachel Grady “elegiac, beautiful and quietly devastating” and Variety hailed it as “a potent snapshot of a potential future for many American cities.” You might recognize Ewing and Grady as the team that brought us Jesus Camp, an alarming hit 2006 documentary about an evangelical summer camp in North Dakota. If you want to catch Detropia before it is widely available, Saturday is your lucky day. That’s because Rooftop Films is screening the movie outdoors on the roof of the Old American Can Factory, complete with live music beforehand and a reception afterward. All in all, we think it sounds like a pretty great way to see a film that is guaranteed to have a lot of people talking this fall. Tickets are $12.