High Holy Days:

Requiem of the Prophet (3/15) — the solemn commemoration of the Prophet’s passing into the final dream.

Walpurgisnacht (4/30) — otherwise known as St Walpurga’s Night, Walpurgisnacht is a night of bonfires, witchery, and revelry.

Midsommar (roughly 6/21**) — the celebration of midsummer; a time of great eldritch energy and high magick.

Nativity of the Prophet (8/20) — the joyous celebration of the Prophet’s birth from the Void into dreaming existence in our ephemeral world.

Canak’thatep (roughly 9/22**) — also known as Mabon, Canak’thatep (the Macabre Day in R’ylehian) marks the fall equinox and the beginning of Autumn; a season of slow decline into winter, when all manner of ghoulish energies begin to course through the Earth, and the attentions of the world turn toward the supernatural.

Allhalloween (10/31) — otherwise known as All Hallow’s Eve, Allhalloween is the premiere festival of the Weird, mad, and otherworldly; a time when the veil which shrouds our perceptions grows thin and our nature as dreamt figments presses closer upon us.

Longest Night (roughly 12/21**) — the celebration of the winter solstice and the longest night of the year; during this time great forces and energies roil our world and the powers of the Old Ones wax ever-greater.

Lesser Holy Days:

St Clark’s Day (1/13) — the celebration of the birth of Clark Ashton Smith, a friend and contemporary of the Prophet.

St Edgar’s Day (1/19) — the celebration of the birth of the mad seer and prophetic forerunner Edgar Allan Poe.

St August’s Day (2/24) — the celebration of the birth of August Derleth, first publisher of the Prophet’s visions and eventual emcee of what became the ‘Cthulhu Mythos’.

Cthulhumas (4/2) — the date cited in The Call of Cthulhu, Cthulhumas is dedicated to celebrating and propitiating the High Priest of the Old Ones and beseeching him to tear asunder the veil of separation.

St Edward’s Day (7/24) — the celebration of the birth of Lord Dunsany, a prolific author who was a significant conscious influence on the Prophet’s oeuvre.

Dia de los Muertos (11/2) — originally a Mexican celebration, Dia de los Muertos is, appropriately, a festive commemoration of all those who have vanished into the final dream.

Krampusnacht (12/5) — originally an Alpine and Eastern European tradition Krampusnacht is in a sense the cultist’s Christmas, a time of gift-giving which is simultaneously a time to reflect upon our wrongdoings and poor behaviours over the previous year.

** cultists in the Southern Hemisphere should celebrate Midsommar around 12/21, Canak’thatep around 3/21, and Longest Night around 6/21