Originally Posted by IndyRC_Racer

The best solution would be to run a combined event on a large outdoor track where you could run a 20 car main where you could take the top 10 of each class and run them at the same time. Keeping track of the class leader and announcing it might be a challenge, but I suppose you could enter the racer's names in such a way that would help you designate the class they were driving. I can really see this working outdoors as long as there would be a place for all the drivers to stand.