All Entrants: Are not permitted to conduct any business activity including buying/selling transactions, the display or distrubution of promotional materials such as business cards, brochures, banners, excessive stickers or wrap, 'For Sale' signs (except for drive.com.au for sale signs supplied by Auto Salon) or company/promotional signs of any nature. Cometitors will be disallowed entry into the show and/or disqualified from judging should this rule be broken.
Now, we were allowed to leave SAU cards on the cars last time, but I think the idea is that you can not stand there handing them out. If someone is interested enough, they will take a card... But it seems like any advertising (of a corporate body) is strictly prohibited unless that corporated body are in fact, the entrants.