Not sure if this will work, but, I emailed the company for one for the chicago area for ticketmaster and they said to use 'FUN'....give it a try...post here if it works! Good luck.
Ok, one other thing...check if its a 'Feld Inc.' production...if so, go to their website, sign up to be a preferred customer, then email customerservice@feldinc.com and tell them that you signed up to be a preferred customer and didnt get the advance code yet. Thats what I did to get the 'fun' code. If its not part of the Feld productions, then I'm not sure.