April 1: International April Fool's Day April 2: International Children's Book Day April 7: World Health Day (1950) April 15: Africa Freedom Day April 2 1: National Entrepreneur Activity Day (1994) April 22. 2nd: Earth Day (1970) April 22nd: World Law Day April 23rd: World Book and Copyright Day (1995) April 24th: World Youth Anti-colonialism Day (1957) April 24th: Asian-African Journalists Day April 25th: National Children's Day. Day: World Intellectual Property Day (200 1) April 27th: Sister City Day April 30th: National Traffic Safety Reflection Day April 4th: World Children's Day (1986) Wednesday of the last whole week in April: Secretary's Day May1:International Labor Day (/kloc-0) May 4th: May 4th Movement Memorial Day (1965444 Asthma Day (1998) Second Saturday in May: World Hypertension Day (2005) Second Sunday in May: Mother's Day (19 14) May/kloc- 5438+05: International Family Day (International Consultation Day) (1994) May 17: World Telecommunication Day (1969) May 18: International Museum Day (1977). May 20th: National Breastfeeding Publicity Day (1990) May 20th: China Student Nutrition Day (1990) May 20th: World Metrology Day (1999) May 22nd: International Biodiversity Day (2000) The third Sunday in May. 1963) May 26th: World Challenge to Human Conditions Day (1993) May 27th: Shanghai Liberation Day (1949) May 29th: International Peacekeepers Day (2002) May 30th: May 30th, Anti-imperialist Movement Memorial Day (May 30th).