Below are some of the important events:
- Birthday of the Raja (Perlis)
- Christian Feast Day:
- Paschal Baylon
- Restituta
- May 17 (Eastern Orthodox liturgics)
- Constitution Day (Nauru and Norway)
- Earliest date on which Trinity Sunday can fall, while June 20 is the latest; celebrated on the first Sunday after Pentecost. (Western Christianity)
- Feast of 'Aẓamat (Bahá'í Faith)
- Galician Literature Day or Día das Letras Galegas (Galicia)
- International Day Against Homophobia and Transphobia aka IDAHO
- Liberation Day (Democratic Republic of the Congo)
- National Famine Memorial Day (Ireland)
- Navy Day (Argentina)
- World Information Society Day (International)
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