Food Sources:
Pickings are going to be slim in the arena even when everything is open. Right now I'm just seeing hotdogs, cheeseburgers, and chicken nuggets. At some point we should have barbecue pretty good last time we were here) and carved turkey sandwiches.
Reports and promo materials indicate that the FanFest (under same roof but outside arena) has wraps, salads, soup, panini and something hot. Meatloaf and pasta have been mentioned; it may be just one hot item each day. I haven't had time to go over there yet. FanFest may not be open far into in the evening (hours vary by day), so probably better as a lunch option. It will not be open on Sunday.
Outside the complex but nearby on the corner of West Gate City Blvd and Ellington is a Middle Eastern fast-food spot called Ghassan's. The menu is limited but three of us enjoyed our food. The offerings include falafel and what seemed to be an all-vegetarian mezze plate.