I think most of the aircraft are actually kits, not originals. Air races run VERY low and do present a different kind of risk compared to air shows. Maybe they could raise the floor around the grandstand area, or possibly move the race course in a manner that puts the grandstands in the "infield". A friend of mine had tickets to those VIP box seats that got wiped out. He goes to the air races all the time but this year he decided to go to a regional club shoot our fireworks club takes part in every year.