Commercial General Liability help for a wedding

Hello all. I am having the wedding at a historic mansion through the Parks & Rec. of the city I live in. They require a Certificate of Insurance (COI) for my wedding. They have sent me a checklist for the COI including the type of insurance they want (commercial general liability, automobile liability) and the exact wording they want on the COI. However, when I google search “Commercial General Liability insurance” to purchase, all the insurance sites are asking for the name of my “business”. How do I get the type of insurance the city wants if I don’t have a business? Or am I just doing this wrong? I’d appreciate any help or advice. Thank you.