Many a time I've gone bowling, and swung by the Sonic for a bite to eat afterwards. At the time these photos were taken, I believe the fairgrounds were cleaned up once a year for the fair. Also, sleaze pioneer Dave Friedman ran the county fair. I don't believe it is clear in these pics, but directly across the street from the Sonic is a graveyard.
You can watch Dave Friedman carrying on at the County Fair in the documentary, Mau Mau Sex Sex.
If you look closely at the above photo, you can see the grave markers in the distance.
If you take a close look at the above pic, you can see the graveyard to the left, and the fairgrounds to the right, with the skeletal remains of a Sonic Drive-In smack dab in the middle.