Are you sure about a cloth that goes to the ground, with pottery on display?
IME most customers are lovely, but I remember one who argued with me about what my art 'was really about' (hint: she was wrong). Another told me she thought my work was fabulous, unlike anyone else's, & did I have a business card with my web address on it? She wasn't buying anything, so I pointed out that my cards (which were very popular as there wasn't much that was low-priced at the art fair) were only £1 each & had my web address on the back - to which she replied, "Oh no, I don't want to buy anything! But I love your work so much that I want one of your business cards," which was annoying because I produced my own cards with my images on them & I felt I had to hand one over when it was obviously going to waste.
Also, prepare yourself to be told about relatives who do/used to do 'exactly what you do' - even if that turns out to be nothing like what you do. This happened so much at craft rather than art events that I used to steel myself against it, & it always happened several times at each event.
And be prepared that someone will love what you do but prefer it in another colour. Or size. Or finish. Or shape. Sometimes they'll tell you that you ought to produce that, & that you'd sell lots more if you did. The first time this happened to me, I listened & made what was suggested, took them to the next sale & didn't sell a single one.
Other stallholders can be great. They're useful sources of information & can be encouraging & even buy your items! I sold one top-price item to a stallholder before the sale even opened, which was a fantastic start. On the other hand, the stallholder next to me at one event set up her stall & then stood in front of mine surrounded by her family & friends, so no-one could see or get near my stuff. I was getting a bit edgy. Luckily they all moved when the sale opened. I was a customer at another one, where one stallholder did nothing but moan loudly, & I felt sorry for her neighbouring sellers as she was ruining the mood & putting people off going near her.
Hope it goes well, you enjoy it & sell lots.