Yes it is at the Coliseum. The law against carrying at a "school event" was struck down last year. I also think they recently struck down the clerical error that would have caused it to come back this July.
I have CC'd at the Shrine Circus for several years with no problem. I am not sure what the Coliseum's policy is in regards to weapons but you should be fine if you a carrying concealed.
As for the Coliseum itself I'm guessing they have a pretty lax policy on guns being that they host a big gun show every year. I did not know though it the Shrine Circus had their own policy while they are renting the facility though and maybe tried to enforce it with wands or something.
My brother was at the Coliseum for the Tractor show this week and he says it is posted NO GUNS at the door. However, they weren't checking anyone, so he had no issues.
There were "NO WEAPONS PERMITTED" signs posted in the entrance to the circus fair. I didn't notice them anywhere else. They said in small print "at the request of the mizpah shrine circus".