IMRA OPENER NOW APRIL 16 AFTER BURLINGTON WEATHERED OUT _Front Page News, POWRi IMRA Midget Series, United States Auto Club From USAC Burlington, IA……..Inclement weather has forced cancellation of Saturday’s USAC IMRA Midget debut at 34 Raceway Park. The series will now open April 16 at Spoon River Speedway in Canton, Ill. usac Illinois Midget Racing Association