The 'theme' cars/bikes for the month (plus a few others according to the stewards' preferences) park in the courtyard garden on a first-come first-served basis, and there's loads of external parking for everyone else. Although it doesn't open until 8.00am there's always a few early birds in the queue before that.
It's usually a good event, especially if the sun shines. You'll find pics from previous years on the Maserati Events tab.