There are some activities specifically to entertain young children. Outside the stadium near Cameron (on K'ville) there's a bouncy house and face painting is available. Inside the stadium there are some activities as well.
The concessions in the stadium include hot dogs which many children will eat. There's also pizza which may appeal to younger children. Be advised that you won't be able to take any food or beverages into the stadium unless you can document a medical need. Here's a rundown of all sorts of game day information:http://www.goduke.com/ViewArticle.db...ATCLID=1178945
It's Homecoming Weekend and Duke Employee Day, either event could add quite a few people to fill the stadium. Between 10A and noon there will be a free open practice presented by the men's basketball team... another event that could draw a lot of people on campus to compete for the public parking.