King's Birthday is celebrated in Sweden every April 30, marking the birthday of King Carl XVI Gustaf. This holiday, popularly known as King's Day, is observed nationwide and is marked by various spectacular events organized throughout the country. The King, who ascended to the throne in 1973, personally receives congratulations and gifts from his subjects on this day. His reign has been notable for the introduction of absolute primogeniture in 1980, a significant legal change in European monarchy that allows for gender-neutral succession. The celebration reflects the Swedish people's affection for their monarch and is an important occasion in the national calendar.