Demoncy is farily good live, and their early work is of course quite good.
Thus Defiled... did anyone ever care about this band?
Catholicon - don't know the music, just the name.
Vesperian Sorrow - think Dimmu Borgir, except very openly gay.
Maelstrom - never heard or seen them, but apparently they are crusty punk wiggers who play Dissection-styled pap.
If anything, I'd avoid this show on account of those Killzone Records tools. I have heard they are the typical fly-by-night, "hey lookit me" types who pull together random line-ups like this to try and feel like they're important. Glad to see nobody else here is impressed.