At Buckingham Palace, Queen Elizabeth II will host a lunchtime reception for about 600 of the 1,900 wedding guests
The Daily Mail reports 19 state rooms will be open and guests will be allowed to "wander through areas normally reserved for heads of state and other dignitaries in the palace's west wing."
Photo: Members of the Queen's Guard perform the Changing of the Guard ceremony at Buckingham Palace on April 8, 2011, in London.
Pictures: Prince William and Kate Middleton
Special section: The royal wedding