Random holidays:
New Year's Day
January 1
Lunar New Year
January/February
Chinese New Year
January/February
Valentine's Day
February 14
Mardis Gras
Saturday before Ash Wednesday
Ash Wednesday
46 days before Easter
St. Patrick's Day
March 17
Passover
March/April/May
Good Friday
March/April
Easter
March/April
April Fool's Day
April 1
Songkran
April 13-15
Randomizing…
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Go ahead and laugh but some people take these random holidays seriously. I think, as long as you get the day off, who cares. Don't like these holidays? You could instead generate a random calendar date and make up your own holiday.