Sorry John, just having a little fun, but I think hats and small items such as Polish Eagles on small disks for coffee cups would be a viable item. To be honest, I'd have a couple of hats made with a stamp inside with your contact informaion on it. I'd wear one and have at least a minimum discount order on hand next event, just to see what happens. You don't have to do any work to speak of and you will have a nice paid for ad. Lots of people will ask "where'd you get that?" I have a friend named Bugaiski in N. Carolina I'm thinking about who is proud of his heritage. He's an optometrist and teaches one of our courses. He'd love one of your items.
The more I do, the less I accomplish.