HONOLULU (AP) — Go out for a night on the town in some U.S. cities and you might find yourself waiting while someone at the door of the restaurant or theater closely inspects your vaccination card and checks it against your photo ID. Or, conversely, you might be waved right through just by flashing your card.

How rigorously vaccination requirements are being enforced varies from place to place, even within the same state or city.

Proof of vaccination is required in several American cities to get into restaurants and bars, enjoy a concert or a play, catch a movie or go to a ballgame.

Ticket age...