The 2018 Niswonger Children’s Hospital Radiothon Is Coming Up Soon. The Event Is The Hospital’s Second Largest Annual Fundraiser And Helps Support Pediatric Patients. This Year’s Radiothon Will Support Niswonger Children’s Hospital’s Children’s Resource Center Which Provides Programs, Education, And Support To Families In Our Region. The Radiothon Will Take Place Monday And Tuesday And Will Be Broadcast On Four Of Holston Valleys Broadcasting Corporation’s Radio Stations.