There's a paving project on IN 13, just on the north edge of Middlebury, about 3 miles south of the toll road. There's only about 1/4 mile left to do, so I don't expect the backups to be a big deal. From there, all of 13 is newly paved.
Since you don't have a final leg of the trip selected, here's what I'd do:
Once you turn right on CR4 (Phillip Warner Highway), go about 1.5 miles west to the flashing light and stop sign at CR35. Turn left on CR35 and go a little over a mile to the first stop sign at CR34. Turn right on CR34 for about 3.5 miles, and the fairgrounds are on your left.
See you there!