Near the airport - Gough Whitlam park in Earlwood, just off the M5.
Some photos from a previous event:
https://www.classicjalopy.com/2018/10/2018-sydney-german-auto-fest/
Its well worth a visit!
Lloyds action results. Doesn't indicate if they passed in or actually sold, but does show final prices which is a good way of knowing true market value