"A national day is a day on which celebrations mark the nationhood of a nation or state. It may be the date of independence, of becoming ...
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a republic, or a significant date for a patron saint or a ruler (such as a birthday, accession, or removal). The national day is often a public holiday. Many countries have more than one national day. Denmark and the United Kingdom are the two countries that do not have designated national days." - (en.wikipedia.org 28.06.2021)