Google "sales tax rate, town, state".
I was referring to sales tax. Some of the really large shows here require each booth to use cash registers for all sales to keep track. Smaller shows are not that strict.
True story from a customer about a show that had a sales-tax person present to collect the money. When she realized that she would be at the beginning of his rounds, she went to her booth-neighbors and exchanged her paper money for coins. She had her whole days take was coins. Revenuer came by, looked at her paperwork and asked for the sales tax. So she started counting it out. He couldn't leave without the money and by the time she was done, most of her neighbors had packed up and left. :)