The night of October 31st. Originally a Pagan festival of darkness, and death. Halloween was belived to be the one time of year when the souls of the dead revisited their former homes. The modern use of wearing costumes originated from the use of scary masks used to scare the roaming souls away.

Another name for Samhain, a Pagan festival which is celebrated on the last day of October.

October 31 witch festival.