COI: the corporate non-negotiable
Nearly every corporate venue or event management company will ask for a Certificate of Insurance (COI) before your setup day. This means your liquor liability insurance carrier adds the venue or client as 'additional insured' on your policy. Most carriers offer this as a rider for $0–$25 per endorsement. Build a $50 admin fee into corporate quotes to cover the admin time and any rush requests. If a client asks for a COI and you don't have liquor liability coverage — do not take the job.