If your venue requires you to purchase event insurance, they’ll probably ask for a certificate of insurance (COI) as proof that you have enough coverage. These days, many insurers allow you to purchase event insurance online instantly and download your COI electronically within minutes. However, if you’re planning an event with a large number of guests or more unique coverage needs, it may take a few days to complete the underwriting process. If this is the case, the company should automatically send you a COI as soon as the policy has been issued.