This is the Renault World Series and not sure if anyone will be interested but Moonman and I have been before and it is an awesome day. The whole day is completely free, apart from your food bill which is expensive but nothing to say you can't take a picnic. They have fair for the kids and simulation rides etc, loadsa things really, I'm sure J can remember more than me if you ask him, but anyway, here's the link.
P.s. don't need a ticket for under 16's.