How about a spring, summer, and fall Dirty Dozen Shootout. Each one could be held at a different track. Such as...

Spring - Edgewater
Summer - Kil-Kare
Fall - Tri-State

That way, everyone would be close to their "home" track for at least one event.

Also, to qualify for the DD, you have to make runs at TWO events and then your best run of the season is your DD time.

Simple, effective, and fair!