Princess Mary and Crown Princess Frederik of the Danish Royal Family, National Day, celebrating Self Governance, outside Cathedral Annaassisitta Oqaluffia, Nuuk, Greenland. National Day, celebrating Self Governance, Nuuk, Greenland. From June 21 2009, Greenland moves from being under 'home rule' to 'self-governance' in a ceremony attended by the Danish Royal family and other heads of state.