Some idiots dubbed the 2016 Brexit referendum 'our Independence Day'. As John Oliver remarked: "Britain is already independent. Actually, Britain is what many countries have become independent from."

For instance:

Independence Day (Cyprus)

In Cyprus, Independence Day falls on 1 October. It is celebrated by festivals at schools and a large military parade in the capital. Cyprus became independent from the British in 1960 after Cyprus won full sovereignty from Britain.