April Fools’ Day is not a holiday. It evolved in the years following the 16th century European conversion to a calendar year that began on the first day of January instead of the first day of April. Those who continued to celebrate New Year’s Day on April 1 were considered foolish. People can be so cruel.
Through the years, the pranksters have gotten even. April Fools’ Day has evolved into a culturally encouraged opportunity to humiliate the humorless and expose the dangerously gullible. These are good things.