Event sounds nice.
As your event is going to be in a arena, the idea would be to fix your screens all around and then 1 outside so the biggest one..... sounds like there is space
Otherwise it's difficult to say as we can't really get an idea of how your installation will look like
Also which is cool is to have a rotative beamer in the middle of the tent which turns around . You can make so really cool effects with that. The Amnesia clubs just installed that in their club in Paris, and it's lots of fun to work with.