Zeitgeist Movies is partnering with the BBC to present free screenings of three new films about World War I. The screenings commemorate the 100th anniversary of the start of the war. Three-hour dramatic mini-series 37 Days screens Saturday, August 7 at 4:00 p.m. and examines the weeks leading up to the start of the war. On Saturday, August 9 at 5:30 p.m., it's documentary Royal Cousins at War, which decodes how the relationships among three first cousins — the Tsar, the Kaiser, and the King of England — lead to global conflict. On Saturday, August 15 at 5:15 p.m., it's Churchill's First World War, a drama-documentary told from Churchill's perspective. More info here.