Buckingham Palace Garden is a large private park attached to the London residence of the British monarch. It is situated to the rear (west) of Buckingham Palace, occupying a 17-hectare (42-acre) site in the City of Westminster and forms the largest private garden in London. It is bounded by Constitution Hill to the north, Hyde Park Corner to the west, Grosvenor Place to the south-west, and the Royal Mews, Queen's Gallery, and Buckingham Palace itself to the south and east.

A party is a gathering of people who have been invited by a host for the purposes of socializing, conversation, recreation, or as part of a festival or other commemoration or celebration of a special occasion. A party will often feature food and beverages, and often conversation, music, dancing, or other forms of entertainment.