Knoxville is the seat of Knox County and 3rd largest municipality in the State of Tennessee. That means a number of courts like Knox County and Tennessee State Courts are located in Knoxville. Likewise, Knoxville is home to some of Tennessee's most outstanding lawyers. Knoxville lawyers are familiar with local and Federal cases like bankruptcy, divorce, immigration, and personal injury lawsuits. Aside from the legal business, Knoxville is home to some nationally known institutions that help attract people to the city. The University of Tennessee, the Department of Energy facility Oak Ridge National Labrotory, the National Transportation Research Center, the Tennessee Valley Authority, and a number of business' headquarters. Producers of Bonnaroo Music Festival AC Entertainment, the Pilot Corporation, Sea Ray, Brunswick Boat Group, and Scripps Networks Interactive (HGTV) are all headquartered in Knoxville. That could be why Forbes Magazine named Knoxville among the "top 10 metropolitan hotspots" and "top 5 business and career" cities in the United States. Knoxville events and attractions encourage a number of tourists to visit each year. Blender magazine named Knoxville the 20 most rock and roll cities in America. It plays host to the 17 day long Dogwood Arts Festival, Kuumba Festival, and Boomsday, the largest Labor Day fireworks display in the United States.