Among recent schedule changes or special event amendments:

• Thursday's Repairable Vehicles.com Tri-State Series event at KRA Speedway in Willmar, Minn., has seen the winner's purse upgraded to $2,100; it was originally $1,500.

• Thunder Mountain Speedway in Knox Dale, Pa., has elected to run Friday's $3,000-to-win event unsanctioned; the race was originally on the Zimmer's United Late Model Series.

• Citing Hoosier Tire shortages, the Fastrak Racing Series cancelled Saturday's $3,000-to-win event at Saluda's Virginia Motor Speedway.

• The Southern Touring Late Model Series has cancelled its Sept. 4 event at 82 Speedway in Petty, Texas.