Great that you'll bring your Sandman Hainzy and I'm envious of you going to see Bruce Springsteen ,though I'm not a massive fan of his it should be a brilliant day at Hanging Rock to see him, I had considered buying tickets to go.
Anyway the important stuff for Sunday.... the Bakery opens at 7am and the Hanging Rock venue opens at 7.30am ,so what time would roughly suit everyone?