I was trying to organize a autocross for the local Cobra replica club event. 1 of the only places that I was able to work something out with was the ohio historical society. The agreement was , the club putting the autox on had to have a $ 1 million liability policy just in case something happened to the grounds or a spectator. The cost of renting the historical society parking lot was alot of $ also { I cannot remember but it was around 500- 700 dollars } . On top of that you will need cones ,timing equipment , a trailer to haul everything around, somewhere to store all of the equipment and many things that I cannot think about at this time. You would also have to arrive at 6 am set up the course and then your day will not be done til you have torn down the course and loaded everything into the trailer. You will also have to work the course .
I would say total cost to put on 1 autox every 6 weeks or so may end up costing 3thousand dollars a year. That is alot of money for just a few guys to pay when they can go somewhere else and just show up and run.
It is alot of work to do , but it would be fun .