A simple question really - create whatever comes to mind.
What are your basic regulations? What would the season look like?
I’ve recently been pondering the idea of a 3 race calendar, running the Nordschleife and two other randomly selected international racing venues with historic significance. The rules for entry? You must provide evidence that the car you have entered was originally deemed illegal. The car must not have been altered from that originally illegal specification - it’s the only place where every banned car can actually run.
Alternatively, you could just run this: