I'm going to shoot straight. Knoxville, despite being close to the mountains and outdoor recreation opportunities, is not a healthy city like what you have out west. Most of the businesses close to the stadium are either fast food or student watering holes where food sales are a distant secondary business consideration. The tailgating is a mixed bag with some decidedly family friendly areas, but most of it is overwhelmingly dominated by excessive alcohol consumption. Not to stereotype, but I foresee a bit of a cultural divide. Hopefully, BYU will sponsor a tailgate for your folks who don't want to deal with fried food and rowdy drunks.