How do you get consent to have a friend who is a minor stay in a hotel with you?

Hotels have discovered that unchaperoned teens tend to damage the rooms, and disturb other guests so most of them, by both company policy, and pressure from their insurance carrier, will not rent to anyone under 21. You both may have a problem finding a room. If you are lucky enough to find one of the few you will also need a credit card. Happy hunting.