The National Tractor Pullers Association is in Knoxville for Thursday’s big pulling event. Four classes will be pulling at the Grandstands on Thursday evening – Four Wheel Drive Trucks, Two Wheel Drive Trucks, Super Farm Tractors, and Heavy Super Stock Diesel Tractors. The pull is part of the NTPA’s Midsummer Shootout Series. Tickets are $15 for adults, $8 for 13-18 year-olds. For kids ages 6-12, they’re $4. Kids five and under are admitted for free.