Selling at and running markets in New York.

Certificate of Authority (regular) (New York State Department of Taxation and Finance): Show and entertainment vendors must get a regular Certificate of Authority; a temporary certificate is not available to them and the separate show-vendor certificate was discontinued. Apply online through New York Business Express. Show promoter permit (Form DTF-723) for four or more shows a year (New York State Department of Taxation and Finance): Promoters in that group must register and display a Permit to Operate a Show at the entrance, and report each show afterward. Fewer than four shows a year means no state promoter registration.

Home Processor Registration (exemption from Article 20-C licensing) (New York State Department of Agriculture and Markets, Division of Food Safety and Inspection): Registered home processors are exempt from the state's Article 20-C food processor license. Products must be packaged and labeled at home, sold only inside New York, and carry a home-kitchen statement on the label; foods needing refrigeration, plus items such as pickles, sauces and cheese, are excluded. The page lists no sales cap.

Temporary food service permit (Local (county) health department outside New York City; NYC Department of Health and Mental Hygiene inside the five boroughs; rules set by the New York State Department of Health): The State Department of Health says to contact your local health department to apply for a temporary food service permit, with separate links for outside and inside New York City. Operators must also meet state Workers' Compensation and Paid Family Leave insurance requirements before a permit is issued.

New York State bars a show promoter from letting anyone sell taxable goods at a show unless the seller is registered with the Tax Department, and requires the promoter to make sure each vendor displays a valid Certificate of Authority. Starting with the fourth show a year, promoters must keep each vendor's name, address, certificate number and rent paid for three years and file Form DTF-727 after each show.

State permits, licenses and registrations through New York Business Express (New York State Department of Taxation and Finance; New York Business Express): The Tax Department says that, depending on the type and size of the business, other state permits, licenses and registrations may be needed, and points to New York Business Express and the Department of State to find them. Counties, cities, towns and villages may also require local licenses where you do business.