That band looks sweet, thanks for the link. Anyway, I'm not a huge metal fan anymore, but I like more like, power metal type of stuff nowadays? But I don't really listen to stuff like Pantera or Metallica anymore.
For that concert, I would find it somewhat awkward being with gothyish people, but I'm guessing the people there are probably mostly older anyway.
The most awkward concert I've been to in my life (the only other being a Monkees concert when I was like 7 with my family) was going to a "hardcore" show with my friend. There was one band, The Bronx (who at the time wasn't big at all) that was fairly decent, for being like, hardcore punk. The rest of the bands there were just horrendous. Thankfully, there was no moshing at this concert, but I just didn't understand it at all. So I played Tetris on my cellphone in the back of the concert area (it was a small show, not like a giant stadium, but basically a bar with a place for concerts.) But for that band, I'd feel pretty comfy really. I guess if I were to like the music, I can deal with whatever, but I don't happen to like "hardcore" or like, screaming punk (actually I like Atreyu a bit now, though) rock kind of music. My church has like, a rock group do worship, and I always feel a bit wtf, and it's much worse when the youth group does open mic night and they perform for open mic night, I just feel entirely confused.
I'd go to that concert though, I've regretted missing many concerts just due to money or transport concerns, so try not to put yourself in the same boat.