Hi Hunter,

Check Pollstar -"Pollstar is the only trade publication covering the worldwide concert industry", they do concert sales and post them to their site.
I would check out Ozzfest related stuff cuz it's the biggest metal festival out now. Crue fest II is out or almost out and the Mayhem Festival - Slipknot has had huge sales.
Right now Pollstar is covering the AC/DC tour, Metallica and Iron Maiden.

That sounds like fun, good luck!