National day
Most countries have only one national day each year but some (like India, Bangladesh and Pakistan) have more than one. The different parts of the United Kingdom used to be separate independent nations and still have national days, but the UK does not have one holiday for the whole country apart from the Queen's Official Birthday. (This isn't her real birthday or an official holiday, but a special Saturday to remember her when people are usually already off work anyway.) Denmark is another country that has no official national day.