In all honesty, I think any show no matter how big or small it is, if you aren't a half-retarded freestyler, the client will be happy with you. If you can do basic tricks and not drop the ball a million times that will be good enough. Lights and things like that are actually a big factor, so some experience would help. Whomever gets it, just make sure they are a confident and intelligent type. Just go out there and do the moves you are comfortable with, and don't try to do something stupidly hard that may make you kick the ball off the stage. It's not a competition, so just keep it clean. Also, show some personality, don't be a robot. Robotic performances are probably the biggest problem I see in many freestylers. For some reason, crowds are more entertained by little showman things, than very difficult tricks. I think you should give it to an American, since it is in the USA. The bigger name European freestylers get many more chances for gigs, so it doesn't hurt to give it to someone who doesn't get as many gigs.
In all honesty, it's probably a fairly small show. If it were a big Vegas show, I do not think they would be contacting Beyond Football about this. I think they would find something through a talent agency that is already established. Steve Elias's Freestyle Soccer Canada is one of the main companies contacted in North America for freestylers. There are other companies contacted as well, but they aren't focused only on freestyle.
Who cares about it being a small show? It's probably a paid gig, so I wouldn't complain if I got it.