Ghambar Paitishem (Zoroastrianism)
Ghambar Paitishem celebrates the creation of the earth and the harvesting of the summer crop.
Nowruz is the start of the New Year for Zarathushti who follow the Shenshai Calendar and the beginning of the year 1382 ay (after Yazdegird III, the last of the Zarathushti Kings of Persia).
Fravardeghan Days (Zoroastrianism)
Fravardeghan Days, also known as Muktad or memorializing ancestors, are ten days in preparation for Nowruz (the start of the New Year) observed by Zarathushtis who follow the Shenshai calendar.