Why should one celebrate Half St. Patty's Day? Because once a year isn't often enough to enjoy green beer. (Or to suffer the subsequent foamy green vomit.) This year's Half St. Patty's Day is on September 17, and you can catch the Dead Girls, Steddy P and Sons of Great Dane -- a solid lineup of non-Irish acts -- at the Beaumont for free. There will also be St. Patty's Day Activities (not sure what those are besides drinking), which will probably result green beer-vomit (see above).