Guard: Halt! Who goes there?
Chief Yeoman Warder: The Keys.
Guard: Whose Keys?
Chief Yeoman Warder: Queen Elizabeth’s Keys.
Guard: Pass Queen Elizabeth’s Keys. All’s well.
You may be asking yourself what this dialogue means or who says it. Well, they are the words uttered by some of Queen Elizabeth's Yeoman Warders during the celebration of the Ceremony of the Keys.
1) A letter addressed to the Ceremony of the Keys office.
2) Inside the letter, attach two international reply coupons and an envelope with your name written on it.
Then, if admitted, you will receive as many invitations as you asked for and from then on, you just have to be worried about enjoying yourself. Let's do some time travel...