WORTHINGTON — This Saturday’s Prelude to the Madness racing at the Worthington Speedway will also feature a live performance from the band TrailerPark Country. TrailerPark Country hails from Sioux Falls and features lead singer Dennis Cockerham, guitarist and songwriter Jason Rabbass, bassist Teri Van Nort and drummer Jamie Donaldson. The concert will take place after the races and is free to the public. Their performance is part of the “No Spee…