Samhain, the witch's new year

Samhain (pron.: /ˈsɑːwɪn/, /ˈsaʊ.ɪn/, or /ˈsaʊn/) is a Gaelic festival marking the end of the harvest season and the beginning of winter or the "darker half" of the year. Most commonly it is held on 31 October–1 November, or halfway between the autumn equinox and the winter solstice. Along with Imbolc, Beltane and Lughnasadh it makes up the four Gaelic seasonal festivals. It was observed in Ireland, Scotland and the Isle of Man. Kindred festivals were held at the same time of year in other Celtic lands; for example the Brythonic Calan Gaeaf (in Wales), Kalan Gwav (in Cornwall) and Kalan Goañv (in Brittany). Samhain is mentioned in some of the earliest Irish literature. Many important events in Irish mythology happen or begin on Samhain. It was the time when cattle were brought back down from the summer pastures and when livestock were slaughtered for the winter. In much of the Gaelic world, bonfires were lit and there were rituals involving them, as at Beltane. People and their livestock would often walk between two bonfires as a cleansing ritual, and the bones of slaughtered livestock were cast into its flames. Samhain (like Beltane) was seen as a time when the "door" to the Otherworld opened enough for the souls of the dead, and other beings, to come into our world. Feasts were had, at which the souls of dead kin were beckoned to attend and a place set at the table for them. It has thus been likened to a festival of the dead. People also took steps to protect themselves from harmful spirits, which is thought to have led to the custom of guising. Divination was also done at Samhain. It was popularized as the "Celtic New Year" from the late 19th century, following Sir John Rhys and Sir James Frazer. It has been linked with All Saints' Day (and later All Souls' Day) since the 9th century, when the date of that holiday was shifted to November 1. Both have strongly influenced the secular customs of Halloween. Samhain is still celebrated as a cultural festival by some (though it has mostly been replaced by Halloween) and, since the 20th century, has been celebrated as a religious festival by Celtic neopagans and Wiccans.[5] Neopagans in the Southern Hemisphere often celebrate Samhain at the other end of the year (~30 April–1 May).
From [link]

Death is rarely so apparent than it as at Samhain. The skies have gone gray, the earth is brittle and cold, and the fields have been picked of the last crops. Winter looms on the horizon, and as the Wheel of the Year turns once more, the boundary between our world and the spirit world becomes fragile and thin. In cultures all over the world, the spirit of Death has been honored at this time of the year. Here are just a few of the deities who represent death and the dying of the earth.
Anubis (Egyptian): This god with the head of a jackal is associated with mummification and death in ancient Egypt. Anubis is the one who decides whether or not one the deceased is worthy of entering the realm of the dead.
Demeter (Greek): Through her daughter, Persephone, Demeter is linked strongly to the changing of the seasons and is often connected to the image of the Dark Mother and the dying of the fields. When Persephone was abducted by Hades, Demeter's grief caused the earth to die for six months, until her daughter's return.
Freya (Norse): Although Freya is typically associated with fertility and abundance, she is also known as a goddess of war and battle. Half of the men who died in battle joined Freya in her hall, Folkvangr, and the other half joined Odin in Valhalla.
Hecate (Greek): Although Hecate was originally considered a goddess of fertility and childbirth, over time she has come to be associated with the moon, cronehood, and the underworld. Sometimes referred to as the Goddess of the Witches, Hecate is also connected to ghosts and the spirit world. In some traditions of modern Paganism, she is believed to be the gatekeeper between graveyards and the mortal world.
Hel (Norse): This goddess is the ruler of the underworld in Norse mythology. Her hall is called Éljúðnir, and is where mortals go who do not die in battle, but of natural causes or sickness.
Meng Po (Chinese): This goddess appears as an old woman, and it is her job to make sure that souls about to be reincarnated do not recall their previous time on earth. She brews a special herbal tea of forgetfulness, which is given to each soul before they return to the mortal realm.
Morrighan (Celtic): This warrior goddess is associated with death in a way much like the Norse goddess Freya. The Morrighan is known as the washer at the ford, and it is she who determines which warriors walk off the battlefield, and which ones are carried away on their shields. She is represented in many legends by a trio of ravens, often seen as a symbol of death.
Osiris (Egyptian): In Egyptian mythology, Osiris is murdered by his brother Set before being resurrected by the magic of his lover, Isis. The death and dismemberment of Osiris is often associated with the threshing of the grain during the harvest season.
Whiro (Maori): This underworld god inspires people to do evil things. He typically appears as a lizard, and is the god of the dead.
Yama (Hindu): In the Hindu Vedic tradition, Yama was the first mortal to die and make his way to the next world, and so he was appointed king of the dead. He is also a lord of justice, and sometimes appears in an incarnation as Dharma.
From [link]