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No it is not necessary to have a business permit or license to sell merchandise at any kind of convention.
Selling lemonade that you made yourself and are not trying to make a business out of is legal, but if you want to have a business in that kind of stuff, you need a permit/license to sell.
No you don't need a permit
do I need a permit to sell things in Wisconsin off the street
no
No
Yes
do we need a permit to sell snowcones for one day..
Yes you need a dealer's permit however many people sell small trinkets while traveling without any papers. If you are only selling a little bit of stuff and plan on moving around odds are you won't have problems. If you are selling lots of stuff and going home with a huge wad of cash then some guys from the government will show up sooner or later.
Hell no
In order to sell plants as a business, you will need to first get a business permit. From there, you will need to get a business license.
no you don't