Why is The 'Burg the only track to run three series during Midget Week?

All the other tracks runs the Midgets and Sprints,except Twin Cities runs Focus Midgets. Which is a good fit. Kokomo runs the Midgets and feature only for 2 other series.

I guess with a beautiful track, that the bozo(lol) that runs the place, can not get over the back gate, even when it is a special show.