Get some bands, get it wet, and band it on that side. Maybe hairspray the roots as well. Normally they go back within a week that way, but since your show is in a few days I would band and get a hood, and definitely leave it on as long as you can. All else fails, buy some of the BedHead Control Freak human hair gel from walmart or some hairspray and gel/spray it down. As girly as this is you could try using a flat iron too on show day, I've done that before too.
Pssh.I didn't pick up the wrong lead
It's called a counter canter...
...A very advanced maneuver.