I don't tan my face, either--I don't want to look like I belong in "Somethign About Mary!!!" I've had good luck with dark Lancome foundation & a really dark bronzer (MAC). I find that most girls at the makeup counter are little/no help b/c no one understands what we are trying to achieve. You will probably want to go to the counter with a few shades of protan on your chest/arm so they can match the color better.
My friend used an airbrush foundation by Classified Cosmetics at her last show (available at Sephora) and looked FANTASTIC!
Otherwise, you could hire a professional make-up artist for the day of the show, the going rate around here (San Francisco) is about $150/hr for hair and make-up services (you can save on costs by sharing with a friend or two).
Good luck!!!