The Ceremony of the Keys is a traditional event held at the Tower of London every evening. It marks the official locking of the gates and has been performed for over 700 years. The ceremony involves the Chief Yeoman Warder, known as the Beefeater, who carries a set of keys and is accompanied by a small procession. During the ceremony, the Chief Yeoman Warder locks the gates while a guard stands watch. This event symbolizes the security of the Tower of London and its historical significance. Visitors can witness this ceremony, which is a blend of history and pageantry.