Lady Elizabeth has been planning parties for her cousin, The Queen, since 1960. Notable events has she planned include Sting's wedding, Margaret Thatcher's 70th birthday party, Elizabeth II's 80th birthday party, the wedding of Pavlos, Crown Prince of Greece, and Marie-Chantal Miller and a reception for foreign royals the night before the wedding of Prince William and Catherine Middleton at the Mandarin Oriental Hyde Park Hotel.