Nāg Panchamī (Devanagari: नाग पंचमी) is a festival during which religious Hindus in some parts of India worship either images of or live Nāgas (cobras) on the fifth day after Amavasya of the month of Shraavana. Traditionally, married young women visit their premarital households to celebrate the festival. Especially in villages in India, a traditional aspect of the celebration involves joyous swinging by young women on swings temporarily hung on tree branches.

According to Puranic scriptures, Brahma’s son Kashyapa had four wives. The “first” wife gave birth to Devas; the second, to Garudas; the third --named Kadroo--, to Nāgas; and the fourth, to Daityas. Nāgas were the rulers of Pātāl-Loka.

Youth Day is a public holiday in Morocco on August 21, the birthday of the reigning monarch, Mohammed VI of Morocco.

Admission Day or Statehood Day is a legal holiday in the state of Hawaii in the United States. It is celebrated annually on the third Friday in August to commemorate the anniversary of the 1959 admission of Hawaii into the Union.

Statehood bills for Hawaii were introduced into the U.S. Congress as early as 1919 by Prince Jonah Kuhio Kalanianaole, the non-voting delegates Hawaii sent to the U.S. Congress. Additional bills were introduced in 1935, 1947 and 1950. In 1959, the U.S. Congress approved the statehood bill. This was followed by a referendum in which Hawaiian residents voted 94% in support of statehood (the ballot question was: "Shall Hawaii immediately be admitted into the Union as a state?"), and on August 21, 1959 (the third Friday in August), President Dwight D. Eisenhower signed a proclamation making Hawaii the 50th state.

(Arabic: عيد وفاء النيل‎) has been an important natal cycle in Egypt since ancient times. It is celebrated by Egyptians as an annual holiday for two weeks starting August 15, known as Wafaa El-Nil. It is also celebrated in the Coptic Church by ceremonially throwing a martyr's relic into the river, hence the name, Esba` al-shahīd ('The Martyr's Finger'). Ancient Egyptians believed that the Nile flooded every year because of Isis's tears of sorrow for her dead husband, Osiris.

The three stages of the Egyptian flood cycle were Akhet, the time of the Nile flood, Peret, the sowing time, and Shemu, the time of harvest. Without this cycle people would die from starvation.The flood cycle was so predictable that the Egyptians even based their ancient calendar on it. Akhet was the first season of the year, between the months of June and September. Peret or the Egyptian Autumn season marked the time when their crops grew in the fields and were harvested,^[1] running from October to mid-February. Shemu was the third and last season of the Egyptian year which ran from mid-February until the end of May; it essentially signalled the spring season of the Egyptian calendar.^[2]