Sullivan North to host MMA eventKINGSPORT — Sullivan North High School will host a mixed martial arts competition at 6:30 p.m. on Friday, July 24. Tickets are $20 in advance and $30 at the gate. Gates open at 5:30 p.m. The event is a fundraiser for the athletic department. For more details or for tickets, call the school at (423) 354-1400.Castlewood football practice starts July 30CASTLEWOOD — The first day of football practice for Castlewood High School’s Blue Devils, grades 8-12, will be held Thursday, July 30 at 8 a.m.Interested students must have both a completed physical form and an insurance waiver form to participate.A parent safety meeting is scheduled for 6 p.m.