South By SouthWest is freakin' huge. Its almost a week long, with 30-40 clubs showcasing bands all day and night. You can buy a wristband for a couple hundred dollars and see whatever band you want. I wouldn't be surprised if After Forever was booked, they've booked plenty of metal bands in the past: Dillinger Escape Plan, Cephalic Carnage, Helmet, The Sword, etc. Its mostly indie-rock bands though with a few big headliners. Last year was Billy Idol I think.