Every year on Nov. 1, many Roman Catholics and other Christians around the world observe All Saints’ Day, which honors saints who have attained heaven. In the Eastern Orthodox Church, All Saints’ Day is observed on the first Sunday after Pentecost. In Roman Catholicism, the feast is a holy day of obligation. The first evidence for the Nov. 1 date of celebration and of the broadening of the festival to include martyrs occurred during the reign of Pope Gregory III (731–741).
Although not a public holiday in the U.S., All Saints’ Day is observed publicly in many countries. In France and Germany, businesses are closed. In the Philippines, the day is known as "Undas" and isn't just for remembering the saints, but for honoring departed loved ones, usually extending to the following day of All Souls’ Day. In Roman Catholicism, All Souls’ Day commemorates all the faithful who have departed.