All Saints’ Day, also called All Hallows’ Day, Hallowmas, or Feast of All Saints, in the Christian church, a day commemorating all the saints of the church, both known and unknown, who have attained heaven. All Saints' Day is a celebration of all Christian saints, particularly those who have no special feast days of their own, in many Roman Catholic, Anglican and Protestant churches. In many western churches it is annually held November 1 and in many eastern churches it is celebrated on the first Sunday after Pentecost. It should ...