If you're a club administrator, read.
Here's Wikipedia's definition of Additional Insured.
In order to secure a pitch to play/train on, Municipalities, Park'n'Rec Departments, Churches, and 100s of other entities who have dirt to rent, what some form of Commercial General Liability in place for the renter, and want to be an "Additional Insured." Some even go so far as to demand specific language for the endorsement on the Named Insured's policy.
Lot's of confusion between this language, Additional Insurance, and Named Additional Insured. All a Club Admin cares about is having a fricking area of grass to play/train on, right?
Liability Insurance is all about paying a sum that the insured is legally obligated to pay, or that the insurer has agreed to pay, as damages to others as a result of the insured's negligence.
If the insurer hasn't agreed to pay, you're hosed.
Most Sports CGL policies have a provision called "Blanket Additional Insured by Written Contract", meaning you sign a contract with the venue, and your CGL covers the Venue.
Simple question: Does yours?
Tomorrow: Why a COI (Certificate of Insurance) tells you pretty much nothing...