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 22nd: Lenin's birthday (1870)

April 22: Earth Day (1970)

April 22nd: World Law Day

April 23rd: World Book and Copyright Day (1995)

April 24th: World Youth Against Colonialism Day (1957)

April 24th: Asian-African Journalists' Day

April 25th: National Children's Vaccination Publicity Day (1986)

April 26th: World Intellectual Property Day (200 1)

April 27th: Sister City Day

April 30th: National Traffic Safety Reflection Day

The fourth Sunday in April: World Children's Day (1986)

I suggest you write Earth Day so that you can write O(∩_∩)O~