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• Labour Day
  Cambodia,  1 May
  A relatively minor holiday. Embassies advise avoiding large labor-related gatherings and rallies falling on this day as union disputes can occasionally turn violent.
• Royal Ploughing Day Ceremony
  Cambodia, Siem Reap  2 May
  

  Known in Cambodia as Pithi Chrat Preah Neangkol, this public holiday corresponds to the start of the planting season. Royal astrologers will predict the coming season's weather.
• HM King Sihamoni's Birthday
  Cambodia,  13 - 15 May
  Commemorates the birthday of King Norodom Sihamoni on 14 May 1953. The current king was crowned in 2004 after the abdication of his father, Norodom Sihanouk.