During pre-Islamic and early Islamic Iran, Mehrgān was celebrated with the same magnificence and pageantry as Nowruz. It was customary for people to send or give their king, and each other, gifts. Rich people usually gave gold and silver coins, heroes and warriors gave horses while others gave gifts according to their financial power and ability, even as simple as an apple. Those fortunate enough would help the poor with gifts.
Gifts to the royal court of over ten thousand gold coins were registered. If the gift-giver needed money at a later time, the court would then return twice the gift amount. Kings gave two audiences a year: one audience at Nowruz and other at Mehregān. During the Mehregān celebrations, the king wore a fur robe and gave away all his summer clothes.
After the Mongol invasion of Iran, the feast celebration of Mehrgān lost its popularity. Zoroastrians of Yazd and Kermān continued to celebrate Mehrgān in an extravagant way.
In present time for this celebration, the participants wear new clothes and set a decorative, colorful table. The sides of the tablecloth are decorated with dry marjoram. A copy of the Khordeh Avesta ("little Avesta"), a mirror and a sormeh-dan (a traditional eyeliner or kohl) are placed on the table together with rosewater, sweets, flowers, vegetables and fruits, especially pomegranates and apples, and nuts such as almonds or pistachios. A few silver coins and lotus seeds are placed in a dish of water scented with marjoram extract.
A burner is also part of the table setting for kondor/loban (frankincense) and espand (seeds of Peganum harmala, Syrian rue) to be thrown on the flames.
At lunch time when the ceremony begins, everyone in the family stands in front of the mirror to pray. Sharbat is drunk and then—as a good omen—sormeh is applied around the eyes. Handfuls of wild marjoram, lotus and sugar plum seeds are thrown over one another's heads while they embrace one another.
In 1960s the Postal Service in Tehran issued a series of stamps to commemorate Mehrgan Festival.