Near Miss Day
Near Miss Day is held on March 23. This event in the third decade of the month March is annual. 
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On March 23, 1989, the 300 m (980 ft) diameter Apollo asteroid 4581 Asclepius (1989 FC) missed the Earth by 700,000 km (430,000 mi). If the asteroid had impacted it would have created the largest explosion in recorded history, equivalent to 20,000 megatons of TNT. It attracted widespread attention because it was discovered only after the closest approach.
Similar holidays and events, festivals and interesting facts
As Young As You Feel Day on March 22
International Goof Off Day on March 22
World Maths Day on March 22 (date for 2025);
Puppy Day on March 23
International Day for Achievers or International Day for Achievement on March 24
Tolkien Reading Day on March 25
Make Up Your Own Holiday Day on March 26