Ostensibly, Heima is a documentary about Icelandic post-rock quartet Sigur Rós. Unlike with most rockumentaries, however, the band only appears in about half of the shots in the film. The rest of the screen time is devoted to the people, animals and foreboding landscape of Iceland (“heima” means “at home” or “homeland” in Icelandic). So it’s not hard to see why Iceland Naturally, a partnership between the Iceland tourist board and a handful of Icelandic…

>> Terrific local volunteer organizers Greater DC Cares are hosting a happy hour tonight at Mackey’s with what looks to be free or deeply discounted beers provided by sponsor Samuel Adams. 6 to 8 p.m. Non-volunteers welcome to attend and learn more about the organization. >> The Lost Bayou Ramblers bring their Cajun dance music up from Louisiana for a free concert at 6 p.m. at the Kennedy Center Millennium Stage. >> Black Cat,…