3 Inches of Blood? Don't know about that...though I would scale the rafters (heavy carry that I am) to get just a bit of a listen to Slayer!
FTR--what about Amtrak--a round-trip ticket is now priced at around $100. Granted, you'd perhaps want a hotel room for the evening? I stayed at the Courtyard last year for $120 when NW came to town (granted, it was Bonus-time at work) but 5 miles away for $75 is a good room at the Days Inn, Shrewsbury.
I know a headlining tour may be more attractive--but, as it is Hallows 'Eve and a good Fright-industry is right at the doorstep--maybe it's worth it?