United Nations Day marks the anniversary of the UN Charter’s
entry into force, and celebrates everything that the UN represents and has
achieved since its establishment in 1945. With the ratification of this
founding document by the majority of its signatories, including the five
permanent members of the Security Council, the United Nations officially came
into being.
24 October has been celebrated as United Nations Day since
1948. In 1971, the United Nations General Assembly recommended that the day be
observed by Member States as a public holiday.
Each year, the global network of UN Information Centers
organizes a variety of events to mark UN Day. Activities range from ceremonies,
seminars, panel discussions, symposiums to series of briefings for students,
art competitions, rallies, film screenings and book/photo exhibitions, media
campaigns- including interviews and newspaper supplements- and social media
campaigns.

source: https://images.app.goo.gl/Zi2xkUb5cjeYtNLr7