Nightclub Gig on Tuesday Night

my band Clear Air Turbulence has a 15 minute slot in a Battle of the Bands this Tuesday night at 8:00am, and i must say i'm just a little bit on the excited side first prize is a trip to friggin' Thailand, and other stuff up for grabs is $1000 and some massive television or something.
i guess there's a bit of nervousness involved on my side of things, however - even though the club only packs about 300-400 people, it's a _very_ intimate setting (they're right in your face as you play, and there's a mosh. don't ask me how this works out ). plus it's an overage venue, so not many of our groupies and such can get in to lend support on top of this, we're the youngest band playing (age-wise), i think the only underage group there ... is this going to hamper us in any way? there are two ways you can win, apparetly - a "most popular" band vote by the crowd, and there's a panel of judges there to, uh, judge you.
one more thing that is sort of nagging it me is the fact that we're playing songs with which i have discarded the concept of "set" lyrics - i sing different words to them every time we play them. is this an unhealthy practice? will i fall on my arse and be castrated by the drunken mob slobbering at my feet? will this thread devolve into yet another argument about Osama Bin Laden's left testicle's ability to launch cruise missiles?

 

thank you for bringing the fact that i don't know my AM's from my PM's to everyone's attention, man yeah, whoops, it's at 8:00pm.