Yalda Night
Yalda Night is held on December 21. شب يلدا Shab-e Yalda, Shab-e Chelle - Persian festival held on the longest and darkest night of the year. Celebrated in Iran, Afghanistan and Tajikistan. This event in the third decade of the month December is annual. 
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The festival is celebrated in Iran and other historically Persian-influenced regions, including Azerbaijan, Afghanistan and Tajikistan.
“Yalda Night” was one of the holy nights in ancient Iran, included in the official calendar of the ancient Iranians from 502 BC during the time of Darius I. The festivities that take place on this night are an ancient tradition.
Yaldā Night is an Iranian Northern Hemisphere's winter solstice festival celebrated on the "longest and darkest night of the year." According to the calendar, this corresponds to the night of December 20/21 (±1) in the Gregorian calendar, and to the night between the last day of the ninth month (Azar) and the first day of the tenth month (Dey) of the Iranian solar calendar.
Similar holidays and events, festivals and interesting facts
Navy Day in Iran on November 28
Father's Day in some Islamic countries on January 13 (Iran, Kuwait, Bahrain, Iraq, Oman, Qatar, Egypt, Yemen, Syria, Lebanon, Somalia, Sudan, Mauritania is celebrated on the 13th day of the month of Rajab);
Engineer's Day in Iran on February 23 (This day is celebrated to respect Nasir al-Din al-Tusi, Iranian scientist);
Iran Engineer's Day on February 24
Baloch Culture Day on March 2 (Balochistan);
Tree Planting Day in Iran on March 5
Mother's Day in Albania on March 8 (also Afghanistan, Azerbaijan, Bosnia and Herzegovina, Bulgaria, Burundi, Burkina Faso, Kosovo, Laos, Macedonia, Moldova, Montenegro, Serbia, Tajikistan, Uzbekistan)