When I did shows in Central PA years ago, I was a lousy salesman. However, I was lucky in that my wife was an excellent salesperson. I would stand outside of the booth often, watching the crowd, moving in when things got busy, but often talking to customers on the side or where the talk would not interrupt traffic. My wife would often man the booth, with a friendly smile, answering questions and such until someone wanted to know more than she wanted to say, so she would introduce them to me, and I could continue on the conversation that they seemed to want to have. In the end 50/50 that they would buy. Did they feel welcome, questions answered, learn about me and pottery? Definitely. Did I see any of them in the future? Always, and often made a sale.
Back then I had a stamp made with my logo, and business cards. I used the stamp on brown bags, and included business cards on sales. At the same time specialty items that people did not understand (french butter dishes) I would include a description/explanation of the pots use.