The celebrations on the eve of All Souls Day, called Halloween, stem from the Celtic New Year celebration called Samhain. When the Sun goes down on this eve, there is a time between the old year and the creation of the new. Specifically, this occurs at sunrise.
In this twilight of the years, the veil between this world and the world of the spirit is thin. It is a time when ghosts and spirits can interact with the living, and a time when divination is most effective. This is a sacred time when all warriors were to keep their swords sheathed.
Samhain literally means “end of the summer.” This day marked the last harvest of the summer, and so it is a harvest celebration. But, because there were only three months in the ancient Celtic calendar, and no autumn, it is also the beginning of the winter death that will lead to next year’s regeneration. On this night, the lord of death reigns, and the Celts protect themselves from this threat with bonfires and animal sacrifice. Animal sacrifice is closely associated with divination.
In most ancient cultures, the remains of the sacrificed animal were examined to discover the will of the gods and to predict the future. The Druid priests would take advantage of this auspicious time to look into the events of the upcoming year—at least up until Beltane, which marked the year’s midpoint.
Although predicting the future is not necessarily the best use of the tarot, this is a good time to try reading the future. You can do this by laying out three cards for each of the six months from Samhain to Beltane (you should have eighteen total cards). Read each set of three cards as a story that will pertain to that month.