I made up a sign you can use for meetups to help people locate your group when you are out at a club, pub or restaurant. It's designed so you can fold it in half and then fold in the ends about an inch each so it stands up on its own on a table. Download the attached PDF and print it (preferably in colour!).
Meh - just tell them that you are discussing the merits of the logo design and it is there for discussion purposes. It's not as if it's a huge banner or advertising to other members. You could even just leave it lying flat on the table - if a new member spots it, they will know who we are.
What about more marketing like options. emblazing it on some t-shirts and that can mean anyone walking around wearing one is open to discussions about property. Or stickers on bags, etc Someone eating lunch alone at a mall could just stick the sign up and other PCers walking around might see it and come over for a chat. You could get some PC hats made perhaps. A secret handshake?
Some PropertyChat merchandise has been on the todo list for about 4 years now. One day I'll find some time to do something about it.
That'll only confuse people at the Chatswood meetups - they'll think that they're special to have a property named after them.