You should only register as a vendor if you have a business relationship with Fulton County Government (e.g. , being awarded a contract, purchase order, etc.).Com or call 917-364-5648. Welcome Vendors and Thank you for your interest. To ensure your attendance as a vendor, please complete and return. You must accept the terms of this agreement in order to apply as a vendor with COSF. We welcome businesses of all sizes to register as vendors, learn more about business opportunities, and participate in the procurement process. 3.4 Seasonal vendors are expected to fill out an application to demonstrate their intent to continue vending in all subsequent seasons. DO NOT fill out an application. Once a vendor is accepted, there will be no refunds for any reason.