 At least check into it. This may be one of those things where you're like, why didn't I do this a long time ago? Why not start saving now? Call 855-SHARE-40. That's 855-S-H-A-R-E-40. 855-SHARE-40. Fourth of July weekend. Progressive American Flat Track returns to the Magic Mile in Des Moines, Illinois. The Mission Booth AMA Flat Track Grand Championship League in Des Moines State Fairgrounds explodes on Saturday, July 6th. The Progressive American Flat Track Professional.