Host families are still needed to house sprint-car fans during the 49th annual Knoxville Nationals in August. That’s according to Melinda O’Field with the Knoxville Chamber of Commerce. She says housing builds relationships between the host and guest, and is a good way to show hospitality to visitors.  Those interested can stop by the Chamber for housing forms, visit Discoverknoxville.com or call 828-7555 for more information.