They have mostly snacks (candy bars, cookies, crackers, peanuts) and drinks (coke & pepsi products, water, fruit drinks all in 20 oz. bottles) and there are a few sandwiches similar to what you'd find at a convenience store priced reasonably. They also have a partnership with a local restaurant where you can order sandwiches or pizza to be delivered to the Event Center. Just ask at the front desk.
There is a great Indian restaurant around the corner and a Burger King nearby as well. They're also located about 4 or 5 city blocks from a large shopping area with a mall and food court, lots of fast food options and plenty of good sit-down type restaurants.