A farmers or Saturday market is a great way to test the waters. You can ask other vendors about other shows, and which ones are worth the effort. Any place that has tourists going by is good as well (people spend as much or more than they do at Christmas when they are on vacation). Some of the major shows are requiring liability insurance, some just say you should have it. I will be doing a show in Davis, CA on Mothers Day Weekend, and they have liability insurance available through them. Credit sales help. Our Saturday Market can do transactions for us. Some shows will have ATM machines available. They are all different. If you are planning to visit friends out of the area, ask them about any local shows, and you can avoid motel costs if you stay with friends. It is fun. At least half of the people who will look at your stuff will be other woodworkers. If it is a local show, you can also get good leads on trees. Bartering is great as well. If you have a lousy show, you barter just to come away with some thing. If you have a great show, you barter because you are feeling good. Do take a wood bowl or plate to the food booths. They will fill it up and ask you where you got the bowl.
robo hippy