September 21st Holidays: Celebrations and Observances Worldwide

September 21st is a day filled with various holidays, celebrations, observances, and historical significance around the world. From international events to national holidays and religious commemorations and saints, this date holds special meaning for many cultures and communities. Explore the list of holidays, observances and saints celebrated on September 21st.

Holidays on September 21st

  • Mabon - Neopagan festival of Mabon
  • International Day of Peace of the United Nations, as propagated by Peace One Day
  • In ancient Greece, the eighth day of the Eleusinian Mysteries, when the secret rites in the Telesterion finish and the feast, Pannychis, begins.
  • Philippines - Thanksgiving Day
  • Independence Day in Malta (1964), Belize (1981) & Armenia (1991)
  • Also see September 21 (Eastern Orthodox liturgics)
  • RC Saints - Matthew the Evangelist

Observances on September 21st

  • International Day of Peace