Larson is expected to compete in a majority of the sprint car racing events at both Knoxville Raceway and the Southern Iowa Speedway during the ten - day period .
Larson is a regular with the NASCAR Nationwide Series this season .
Larson , a regular with the NASCAR Nationwide Series this season , is expected to compete in a majority of the sprint car racing events at both Knoxville Raceway and the Southern Iowa Speedway during the ten - day period .