restaurant suggestions in Normal
There is an Applebees, Ruby Tuesday, TGI Friday's, Bennigan's, Baker's Square, and LOTS of other restaurants like that in Bloomington/Normal. Drive down Veteran's Parkway and you'll find plenty of places to eat.
I don't know of an sit-down family type of places close to the stadium. They're mostly fast food places around the stadium.
Avanti's is good and as close to the stadium as you'll get, I think. There is a Denny's on 251 North also. I'm preop so I don't what you would be able to eat at Avanti's. I always eat stuff with their delicious bread (sob, sob) that I'm certain I won't be able to eat for many years down the road (if ever.)