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When is April Fools' Day, also known as All Fool's Day? This is a day for tricks, pranks, and jokes.
There are many World Red Cross and Red Crescent Day Observances.
April 18 is annually observed as the International Day for Monuments and Sites (IDMS). It aims to bring global attention to the need to conserve monuments and sites as our cultural heritage and to “celebrate the diversity of this heritage”.