The regular races scheduled for Saturday night at the Southwest Speedway have been postponed to a yet-to-be-determined date.
Speedway promoter Ken Decker said the races could not be made up on Sunday because of the Memorial Day weekend holiday.
IMCA, which sanctions the track's Modifieds class, and WISSOTA, the governing body for the track's Street Stocks class, must approve make-up dates when postponements occur over a holiday weekend.
