I'm just quickly posting to tell you all about this cool iTunes Plugin: iConcertCal. After installing it (and restarting iTunes), you can go to the visualizer and check out all the concerts in your area from bands that are in your music library! I just used it to find a Killswitch Engage/Dragonforce concert on the 20th at the House of Blues. If it wasn't right in the middle of the week, I would probably end up going, but for those of you with wider tastes in music or time on your hands, this is an AWESOME application.
I reccomend checking it out as soon as possible.