Expo Center in the Tulsa Fairgrounds is an enormous open space of 448,000 square feet of which 354,000 square feet is column free space. This typically is the venue for large trade shows: the Boat show, the Home and Garden show, and others. Several corporations have paid for naming rights over the year,. It has been the Quik Trip Center, and currently is officially the River Spirit Center, but everyone still calls it the Expo Center. It's big.