The official holy days of Thelema are as set forth in The Book of the Law, Chapter II, verses 36-41.

"There are rituals of the elements and feasts of the times.
A feast for the first night of the Prophet and his Bride!
A feast for the three days of the writing of the Book of the Law.
A feast for Tahuti and the child of the Prophet-secret, O Prophet!
A feast for the Supreme Ritual, and a feast for the Equinox of the Gods.
A feast for fire and a feast for water; a feast for life and a greater feast for death!"

 
The Rituals of the Elements are observed at the Equinoxes and Solstices.

The Feasts of the Times are observed as follows:

• The Feast for the First Night of the Prophet and His Bride is observed on August 12.
• The Feast for the Three Days of the Writing of the Book of the Law is observed on April 8, 9 and 10, beginning at noon on each day.
• The Feast for Tahuti and the child of the Prophet. This particular feast is of a character suited only to initiates.
• The Feast for the Supreme Ritual (the Invocation of Horus) is observed on March 20.
• The Feast for the Equinox of the Gods is held on the Vernal Equinox of each year to commemorate the founding of Thelema in 1904 EV, and represents the opening of the Thelemic New Year.
• The Feast for Life or Lesser Feast is celebrated at the birth of an individual.
• The Feast for Water is celebrated at puberty for a girl.
• The Feast for Fire is celebrated at puberty of a boy.
• The Feast for Death or Greater Feast is celebrated at the death of an individual.