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Month-long observances

  • December is Read A New Book Month.
  • Week-long observances

  • No week-long observances.
  • Day-long observances

  • Plain English Day is December 1.
  • Letter Writing Day is December 7.
  • Dewey Decimal System Day is December 10.
  • World Arabic Language Day is December 18.
  • Poet Laureate Day is December 20.
  • Celebrate Short Fiction, Old National Haiku Poetry (more) and National Crossword Puzzle Day is December 21.
  • A’Phabet or No “L” Day is December 25.
  • National Thank-you Note Day is December 26.
  • New Year’s Eve Banished-words List Day is December 31.
  • Latest update: 2017

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