All Hallows’ Eve
Today we celebrate the eve of All Saints. Pope Sixtus IV in 1484 established November 1, the feast of All Saints, as a holy day of obligation and gave it both a vigil (known today as “All Hallows’ Eve” or “Hallowe’en”) and an eight-day period or octave to celebrate the feast. By 1955, the octave of All Saints was removed.