This is the only true family sport that we know of. Everyone comes out to the track, from grandparents to newborns. The National Bicycle League officiates the races. Many families have more than one generation that races. These same people selflessly volunteer countless hours to build and maintain their local tracks as well as other duties.
Riders pay a nominal fee for each event.
Spectators watch for free and they get little support elsewhere. So you can see how important these volunteers are. The reason for their dedication is the children. BMX is big. It is nationwide and year-round.