When was Samhain celebrated in the traditional Irish calendar?

In the traditional Irish calendar, Samhain was celebrated on November 1, marking the beginning of the winter season and the end of summer. The festivities typically began on the evening of October 31 and continued into November 1.1234

In ancient Ireland, the year was divided into two six-month periods by the festivals of Samhain and Beltane (May 1). Samhain served as a time for gathering livestock from pastures and preparing for the winter months. It was widely believed that during this seasonal transition, the boundary between the world of the living and the realm of the dead became thin, allowing spirits and other supernatural beings to move between the two worlds.1234