A couple of years ago, when I was heading back home, I passed a Five Guys not too far from the fair grounds. If you’ve never been to one, it’s a kind of build your own fast food burger chain (pick the number of patties, the toppings, etc.). Everything is cooked to order and the fries are amazing (second only to Nathan’s fries from Coney Island!!!). One point of caution... the portions of fries are rather generous to say the least!!!
They have great burgers - probably the best around from a chain. Unfortunately, the one on US 30 (not too far from the meet) closed at least a couple of years ago. Per their website, there is still one on the east side of town, but it's nowhere near the fairgrounds.
Don't eat there before getting blood work for your physical, and be sure to have your cardiologist on speed dial.