Recurring events established in 1973

United Nations day encouraging awareness and action for the environment

fashion industry event in Paris, France

international observance, 24 October

day proclaimed to commemorate the granting of the vote to women in the USA

international dance competition

award

parade held every Halloween in the Greenwich Village neighborhood of Lower Manhattan, U.S.

biennial robot trade fair held in Tokyo, Japan

thumb|right|Humorina-2007 Humorina (, ) is an annual festival of humor held in Odesa, Ukraine, on and around April Fools' Day (1 April) since 1973. The festival is marked by a large parade in the city center, performances by musicians, comedians, clowns and a large number of fun-dressed people on the streets. These days April Fools' Days' pranks are spread by people and local mass media.

Celebration of voluntary childlessness