When you use your credit card, be sure to keep your receipts. I had a waiter tack on $10 to my food ticket one time and in checking my receipts, found that out when my bank statement came. I got my money back when the bank helped me make the claim. I had my receipt.
Vendors are charged a percentage of the amount on the credit card slip and for purchases under $10 they lose money.
Be careful at all times with your money and credit cards. Be aware of people bumping into you and never lay down your purse without one hand on it and a cord of some kind. The crowds at the show can be confining and the ones who are out to take your money act quickly.
Have fun and don't pass up a good deal
Carol J.