Nowruz

Nowruz: pronounced [nowˈɾuːz]; is the Persian-language term for the day of the Iranian New Year, also known as the Persian New Year. It begins on the spring equinox and marks the beginning of Farvardin, the first month of the Solar Hijri calendar (an Iranian calendar used officially in Iran). The day is celebrated worldwide by various ethnolinguistic groups and falls on or around the date of 21 March on the Gregorian calendar.
Typically, before the arrival of Nowruz, family members gather around the Haft-sin table and await the exact moment of the March equinox to celebrate the New Year. The number 7 and the letter S are related to the seven Ameshasepantas as mentioned in the Zend-Avesta. They relate to the four elements of Fire, Earth, Air, Water, and the three life forms of Humans, Animals and Plants.