What's your vantage point going to be? Are you going to be down at crowd-level shooting up on the musicians? In 'the pit', as it were?
Dunno, I'm not sure you'll necessarily be needing 3200 film -- I'm thinking 800 max would do it. Here again, depends on how close you are to the stage, if you might even be on the stage, and if you're willing to wait for when the lights are brighter on the stage.
Here's one of my favourite rock and roll photographers for inspiration -- he has some concert stuff in the mix there. I'm sure he wasn't shooting at ISO 3200 back in the day:
http://barriewentzell.com/