I was reading about the Feast of Sokar and the Khoiakh Mysteries in Circle of the Sun: Rites and Celebrations For Egyptian Pagans and Kemetics by Sharon LaBorde.
The Feast of Sokar began to merge with the Feast of Osiris during the time of the New Kingdom and by the Ptolemaic period had completely merged. The night before Feast of Sokar, the observance included an over night vigil, likely at the tombs of loved ones (this is similar to the modern observance of El Día de Los Muertos), which was known as “Night of Notjeryt” and it also known as “the Day of Tying Onions,” in which they would tie garlands of onions, which would roughly resemble leis, to wear and offer to the deceased. The modern observance of the Feast of Sokar focuses on honoring the dead; those who worship Set can observe the Feast of Sokar without having contradictions with their veneration of Set. The Festival of Sokar is observed upon either the 10th or 17th of Ka-her-ka (Khoiakh), which is around roughly October 27 or November 3 according to the “Egyptian Civil Calendar With Modern Dates” and “Egyptian Liturgical Calendar” in Circle of the Sun: Rites and Celebrations For Egyptian Pagans and Kemetics by Sharon LaBorde.
The Khoiakh Mysteries had a major component called the Haker Feast. In Abydos, a procession led along an ancient wadi (like a gully or arroyo) into Poker, where the tomb of Osiris had been said to be located, by the standard of Wepwawet and by sem priests, who were involved in the repulsion of the enemies of Osiris. On the night of the Haker Feast, a vigil was held in which. Horus was said to commune with his father Osiris. Through the Late Period and into the Greco-Roman period, the Khoiakh Mysteries had overtook the older Feast of Sokar. The modern observance of Khoiakh Mysteries shares commonalities with Halloween or El Día de los Muertos. The Ancient Egyptians avoided graphic representations or descriptions of the deat of Osiris for fear of perpetuating it. The focus instead on his regeneration and resurrection, which makes me think of the Christian holiday of Easter. It is observed on the 30th of Ka-her-ka, which is around November 14.
According to “The Kemetic Orthodox Festival Calendar” in The Ancient Egyptian Prayerbook by Tamara L. Siuda, there a Feast of Sokar on the 26th of Pa’e-Opet, which is around October 1, a 12-day observance for the Mysteries of Sokar-Wesir at Abdju on the 16th of Ka-her-ka, which is around November 18, and a 10-day observance for the Feast of Ptah-Sokar at Djeseru on 21st of Ka-her-ka, which is around November 22.