Clarence Postier, of Vinita, Okla., polishes the chrome on his 1978 Kenworth K100 cabover on Thursday in preparation for the Guilty by Association Truck Show at Petro Truck Stop at Highway 43 and Interstate 44. The show continues Friday with Big Rig Burnouts and a truck and tractor pull. On Saturday, events include more burnouts with bikes and cars, a kids pedal-tractor pull, celebrity meet and greet with the cast from “Maximum Overdrive,” an auction to raise money for Special Olympics, a convoy to the street party at Mercy Park, and a concert at Mercy Park featuring Curtis Grimes and Joe Nichols. GLOBE | LAURIE SISK