Samhain, All Hollow's Eve or Halloween, as we call it now, is a powerful time of changes for the occult arts. It is the transference from the sphere of the Goddess (summer/life) to the God (winter/death). This passage in the script is part of a ritual enacted to celebrate this time. The intention of the Samhain festival as practiced by the Priestesses of the Goddess is to welcome in a time of change. There are lots of other myths attatched to Halloween (walking of the dead, etc...), but that's a subject for another day. Anyone interested in reading more on Ritual Magic should check out a book called BUCKLAND'S COMPLETE BOOK OF WITCHCRAFT. It's a little freaky in places, but very interesting.
Taken from Lady Pendragon Vol.3, #2