Your first festival will be a trial & error. It will tell you what sells & what doesn't. It will also give you the opportunity to see what others make & how well things sell. Try to do things that are different from everyone else projects & keep the prices reasonable. Keep track of your cost to make items & then just add to that. Keeping prices down & selling is so much better than having high prices & not selling. The area of your craft Festival will also determine on pricing.