Earplugs at the door
I had to giggle at this post in the Twisted events forum. It's not a good sign when the promoter is offering you ear plugs. But good on him as the Cube soundsystem in the wrong hands can be rough as guts.

Hearing is a precious thing and it's all too easily wrecked in dodgy nightclubs. Or in Chelfyn's case from being in rock bands, practicing in tiny rooms with a drummer and a guitar amp on full. I used to wear earplugs all the time at gigs, or my ears would ring for three days afterwards.

Update: iPods may cause a whole generation to damage their drums as the unbiquitous white earplugs are more damaging than old skool walkmans: iPods may damage hearing