Conversation so far:
When did Diana Princess of Wales get engaged?
Charles, Prince of Wales, proposed on 6 February 1981, and Lady Diana accepted, but their engagement was kept secret for the next few weeks.
Does the article mention Diana Princess of Wales's engagement ring size or kind of stone?
Diana, Princess of Wales, selected an elegant, large £30,000 engagement ring, consisting of 14 solitaire diamonds surrounding a 12-carat oval blue Ceylon sapphire set in 18-carat white gold.
Who made Diana, Princess of Wales' engagement ring?
Diana, Princess of Wales' engagement ring was created by then-crown jeweller Garrard.
What came after Diana, Princess of Wales engagement to Prince Charles, Prince of Wales?
Following the engagement, Lady Diana left her occupation as a kindergarten assistant and lived for a short period at Clarence House, which was the home of the Queen Mother.
Where did Diana Princess of Wales go after leaving the Clarence House?
Lady Diana then lived at Buckingham Palace until the wedding.
When did Diana Princess of Wales get married to Prince Charles?
Twenty-year-old Lady Diana became Diana, Princess of Wales when she married Charles, Prince of Wales on 29 July 1981 at St Paul's Cathedral.
Are any costs mentioned about the wedding of Diana Princess of Wales and Charles, Prince of Wales?
The cost of the wedding of Diana, Princess of Wales, and Charles, Prince of Wales was later estimated to be $48 million in total, with $600,000 being spent on security.
What happened after Diana, Princess of Wales got married to Charles, Prince of Wales?
Diana, Princess of Wales and Charles, Prince of Wales were driven over Westminster Bridge to catch the train from Waterloo station to Romsey in Hampshire to begin their honeymoon.
Any other interesting things you can tell me about Diana Princess of Wales besides engagement to Charles, Prince of Wales, engagement ring, engagement ring jeweller, Clarence House, Buckingham Palace, wedding, wedding costs, and the honeymoon?
After she became Princess of Wales, Diana automatically acquired rank as the third-highest female in the United Kingdom Order of Precedence.

Question: How many people watched it in person?
Self-contained rewrite: How many people watched the wedding of Diana, Princess of Wales and Charles, Prince of Wales in person?