I'm a pain in the a$5, I'd take my camera, if given a hard time I would ask if they stopped everyone with their cell phone camera too and asked them not to bring them in of use them. Can't see why on earth you couldn't, but who knows.
You know where the site is, find someone and ask (Scary I know asking questions around a Circus)
Jen I just looked no website. I did find some photos of Circus's, but not as many as I thought.
Tough Call