The closest the general public normally get is parking all the cars at Fed Square and then driving them out to the forest to start playing properly and this wont grab the publics attention.
By having an event this close and proper facilities for the punters it might just attract a few to venture out to the forest to see it for real.
Here's a Coca-Cola advert from the early 1970's featuring Rallycross filmed at Calder Park.
http://www.youtube.com/watch?v=F8AQqKiqSp0