I do craft fairs, but I'm not the most experienced vendor yet...
For display, you'll want to play around with your display before you go to any shows. Decide which set up looks, works, and sets up the best. Plus you should think about a sign.
Come prepared. Bring things like lunch, business cards, emergency kit, change of cloths, etc. If you are doing any outdoors shows, it's best to have a tent, tarp for muddy ground, weights and bungee cords for wind proofing (clamps, rope, and tarps for walls too).
If it is possible, bring some projects to work on. You'll build up inventory as well as show customers how it's made.
Here is a great place to get more info
https://www.etsy.com/teams/8070/craft-fairs-its-a-living