Samhain is a Wiccan holiday, celebrated by Wiccans, some Pagans and some witches. It falls on the 31st October and is considered to be the Wiccan new year by many.
A time when the veil is thin, allowing spirit work, ancestral workings, astral projection and fae work is considiered easiest. It is important to take care during this time, especially within magickal workings as connection with other beings is easy and protections may be required. It is a good time to start working with ancestral spirits, spiritual being and others while the veil is thin as well as a time to look back over the year and to look ahead for the future.