Chaharshanbe Suri
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Chaharshanbeh Suri or Charshanbeh Suri, is an Iranian festival of the fire dance celebrated on the eve of the last Wednesday of the year, of ancient Zoroastrian origin. It is the first festivity of Nowruz, the Iranian New Year. Wikipedia
Date: The last eve between Tuesday and Wednesday of the year, before the vernal equinox
Related to: Nowruz, Sizdebedar