Kilkennys is a good option. But depending on the weather... there's a cool outdoor cafe on the river -- 1.5mi from BOK Center -- that I'd recommend to anyone looking for decent food and cold beverage before/after the show. http://www.bluerosecafetulsa.com/
Or 0.7mi away is a cool German-inspired spot with excellent sausages, duck-fat fries, etc... http://www.fasslerhall.com/