Sorry, repurposing a preofessional racetrack??? There are a lot of amatuer events held on these track all year. It's a racing facility. They aren't specific to "professionals". That's just fancy wording to convey emotion. Closed course is really what it is.
Or, my poor, lack of skill client couldn't ride a motorcyle at 50-70% speed through a corner without running off the pavement.
Where are you planning on holding an event like this if not on a Closed course facility... the walmart parking lot.
I wish I was on the jury in this one.