Digital Delivery Networks is the title sponsor for this year’s World Challenge race during the 49th Annual Superclean Knoxville Nationals. The Knoxville Raceway tells KNIA/KRLS News that the PC marketing company will sponsor the 20-lap, $10,000-to-win event, which is being held Friday evening during Nationals. In related news, the All Around Attractions Carnival is being held Wednesday through Friday starting at 11 a.m. daily on Fourth Street in-between Montgomery and Robinson Streets. The carnival will also open Saturday after the annual Nationals parade at 10 a.m.