The flag of the Commonwealth of Nations is flown at Marlborough House, London, the headquarters of the Commonwealth Secretariat, throughout the year, and for a limited period at other venues where Commonwealth meetings, events, or visits are taking place (for example, Commonwealth Heads of Government Meetings). The Canadian federal government does not stipulate that the flag be flown for Commonwealth Day, instead directing that the British Union Jack (officially called the Royal Union Flag) be flown at federal installations which have a second flagpole.[5]