I would guess that those are the only dates that work for the teamropers just like they are the only ones that work for wrestling. The same thing happened over the years at the Coliseum during the high school state. The horse people had an event going on in the pavillions next door. But the Coliseum had enough parking to accomodate both events. Maybe there is something about wrestling that attracts horse people?
Those are the date worked out by the Expo Center and the Stock Contractor.
We really don't care when they have the ropings the same crowd will come.
Kids State is set in stone and isn't flexible enough to move.