The best thing would be to look at your first show as a learning experience. Put your best foot forward & keep your eyes & ears open.
If you make some money - great, if not - use what you learned for next time.
Good Luck!
Connie
That's about the best advice to be given.
I view what happens at every show I attend as a learning experience - what sold, what didn't sell, why, and what was the clientele like at each show so I know for next time what to have available to cater to the crowd that comes to the show.
Take notes. If you get a pause in the action write down observations. What are customers and those who look and then walk away saying, what comments are they making. Listen and then from there figure out what to change.
For example at the Art's festival a couple weeks ago it seemed that while I had something unique compared to the other jewelry vendors, and my prices were reasonable, people were seriously looking for things that fell into one of three categories: dirt cheap, unique, or artistic. People were shopping for gifts for others, and looking for that unique piece no one else had.
Be prepared for the unexpected as well. Bad weather being the most obvious thing to be prepared for.
Be prepared to know the name of every stone you have as well. I had one lady who was looking at my jewelry and would point to a stone and ask what it was. In a few cases I was not wholly positive on the ID but knew it to be a Jasper so I just said "Jasper." She must had eyed up and asked about half the pieces on my table. She eventually bought a piece as well, but she took her time and asked a lot of questions. Be prepared for the questions that might be odd or leave you going "huh?"