If friends are going with you try to get a list of workshops or classes and divide them up. If each of you attend just one or two classes you can show the others what you have learned later and all of you will have more time to shop. Don't forget to make a few pins to trade with others. Some people put their name and address on the back so they can make new friends. Pins don't have to be elaborate, just one image stamped and colored can make a nice pin.
Some people use double-sided carpet tape instead of pins on the back.
Pins are usually laminated, but hey don't have to be. Sometimes vendors will need people to work in their booths for them. If you have a relationship with a vendor see if you can work for them. Most vendors will pay in product only and you will usually get in free. Bring a knapsack or large shoulder bag so your hands will be free.