The trigger is usually booth access, not a general insurance review
A farmers market, craft fair, city event, festival, venue, sponsor, or organizer may require proof of insurance before assigning a booth. The packet may say, "the market must be additional insured," "the city owns the park and must appear on the certificate," or "send a COI before we release your booth location."
This page is for event and market paperwork. Etsy seller insurance fits online sellers becoming commercial sellers, handmade soap and skincare insurance fits topical product liability, food truck insurance fits mobile food units with auto, equipment, commissary, and permit questions, and wedding photographer insurance fits venue COIs for event service providers.