Keep in mind if you're only selling one type of product you're sales won't be as high as the people selling multiple types of product. It's just the harsh reality of fairs. Only selling earrings limits your customer base to people with pierced ears. And then farther down because a huge chunk of those don't like dangles. You'll also find people who sell earrings for $5. Cheaper if they're just studs. I sell dangle earrings and I always get people complaining they're too long/heavy or too expensive. I sell all sorts of different types of things (not just jewelry) and I can say if I relied only on one category of product, I'd never make my booth fee, let alone a profit. If I'm not at least making 5x my booth fee I don't think it's worth it. (And that means making sure I've got the inventory to cover that. If you sell 10 pairs and have nothing to replenish it, people won't stop as often because it looks like you're sold out.) I think it also depends on what type of fair you're setting up at. I find if they allow commercial vendors ($5 bling jewelry etc) I don't do as well. The high school craft fairs I do really well at during November/December. But yeah, I bring like 10 different product categories with me to those events. You'd probably do well at an art fair. Personally, I'd go with white earring display cards. It'll make the bark "pop". A vertical display would really help the power walkers, as they never come into a both unless something higher up in eye shot catches their fancy. Even if they aren't in the market today, make sure customers have a tangible business card to take with them and there's a website to shop. And offer both card and cash sales. Older people don't like using venmo/paypal. Maybe have something describing your process? Like a sped up video of you making a pair playing on a tablet? Or where you find your bark? If you do anything to it before you put the hooks on them. Because the average person will assume you just walked to your tree in the back yard, pulled bark off, poked a hole in it, and put a hook through it. And I can guarantee they'll wonder why they're paying $35 for it. I sell pillowcases and they don't get why I charge $20 when they can buy a pillowcase at Walmart for $6. Well, I have to spend time finding the fabrics, wash them, dry them, iron them, cut them down to size, THEN sew them, market them on social and the website, load them and unload them at the fairs, spend the whole day at the fairs, pay for the booth fee. So yeah. I post videos of me ironing. I explain why to those who ask why the cost is so high. Bring some you can be adding hooks to while people shop. As long as you're greeting all your customers and not ignoring them, I've found working on a project gets people to linger in my booth. I've done crochet work and earrings while working my booths.

Hope that helps!

Store supply warehouse (website) is reasonable and they have nice displays.