Investiture II or another member of the royal family each year. A list of those to be honoured is published twice a year, in either the New Year Honours or the Birthday Honours. Approximately 25 investitures are held annually: most in the Ballroom at Buckingham Palace, although the Waterloo Chamber in Windsor Castle and the Palace of Holyroodhouse in Edinburgh, Scotland, are also used. In 2014 The Prince of Wales held an investiture at Hillsborough Castle in Northern Ireland. Investitures are also held in other Commonwealth realms, when the Governor-General acts on behalf of the Queen. The poem "The Investiture" by
Holyrood Palace transformed Holyrood into a 20th-century palace. Central heating and electric light were installed prior to his first visit in 1911, and after the First World War improvements to bathrooms and kitchens were carried out. In the 1920s the palace was formally designated as the monarch's official residence in Scotland, and became the location for regular royal ceremonies and events. The present Queen spends one week at Holyrood in summer, during which time investitures are held in the gallery, audiences are held in the morning room, and garden parties are hosted. While she is in residence, the Scottish variant of the