From a press release:

Oklahoma City Formula USA Dirt Track Goes to a Cooler Date

New date is June 22nd for Oklahoma City Moto TT Dirt Track National

AURORA, Ill., (April 18, 2002) – Clear Channel Entertainment’s Motor Sports division announced today a change in the 2002 Formula USA National
Dirt Track Series presented by Drag Specialties.

The previously announced July Oklahoma City Moto TT Dirt Track National, round 5 of the Formula USA National Dirt Track Series has been moved to Saturday June 22nd.

“The date change puts the Oklahoma City Moto TT event onto a better weekend for weather, fans and for the riders’ routing needs. It’s a great move for the series and we’re looking forward to going to Oklahoma City in June” said Bob Moran, director of dirt track racing for Clear Channel
Entertainment’s motor sports division.

The 2002 Formula USA National Dirt Track Series schedules is as follows:

Sat, Apr 27 Baytown, TX Houston Raceway Park

Sat, May 4 Mesquite, TX Devil’s Bowl Speedway

Sat, June 8 Plymouth, WI Sheboygan County Fairgrounds

Fri, Jun 14 Rochester, NH Rochester Fairgrounds

Sat, June 22 Oklahoma City, OK State Fair Speedway

Sat. Jul 20 Duluth, MN Proctor Speedway

Wed, Aug 7 Rapid City, S.D. Black Hills Speedway

Sat, Sept. 14 Sacramento, CA Cal Expo *

Sept. 21-22 Tacoma, WA Tacoma Dome

Sat, Sept. 28 Boise, ID Les Bois Park

Sat, Oct 5 Del Mar, CA Del Mar Fairgrounds Short Track

Sun, Oct 6 Del Mar, CA Del Mar Fairgrounds Mile/Grandstand *

* (No 80cc class)