In 1933, the Centenary Celebrations were combined with a Merchistonian Weekend which involved a cricket match against old boys, a concert and a service of thanksgiving in the Memorial Hall.
On Monday 26 June 1933, the School was honoured by the presence of Their Royal Highnesses The Duke and Duchess of York (later to become Their Majesties King George VI and Queen Elizabeth). The Royal Party was welcomed by the Headmaster, Cecil Stagg, and the boys who, in blazers and white shorts, lined the School drive. Lunch was served in the Dining Hall for guests and the Prizegiving Ceremony followed, with speeches by the President of the Merchistonian Club and His Royal Highness The Duke of York. The Headmaster gave a report on the success of the new Merchiston Castle School and the Duchess presented prizes to the fortunate winners. To conclude the day, Her Royal Highness planted a tree to commemorate the visit and watched gym displays on the Gibson Lawn.