In terms of Western Christian theology, the feast commemorates all those who have attained the beatific vision in heaven. Specifically, in the Roman Catholic Church, the next day, All Souls' Day, commemorates the departed faithful who have not yet been purified and reached heaven.

IN THE EAST

Among Eastern Orthodox and Eastern Catholics, All Saints Sunday (Greek: Αγίων Πάντων, Agiōn Pantōn), follows the ancient tradition of commemorating all saints collectively on the first Sunday after Pentecost.

The feast of All Saints achieved great prominence in the ninth century, in the reign of the Byzantine Emperor, Leo VI "the Wise" (886–911). His wife, Empress Theophano—commemorated on December 16—lived a devout life. After her death, her husband built a church, intending to dedicate it to her. When he was forbidden to do so, he decided to dedicate it to "All Saints," so that if his wife were in fact one of the righteous, she would also be honored whenever the feast was celebrated. According to tradition, it was Leo who expanded the feast from a commemoration of All Martyrs to a general commemoration of All Saints, whether martyrs or not.

This Sunday marks the close of the Paschal season. To the normal Sunday services are added special scriptural readings and hymns to all the saints (known and unknown) from the Pentecostarion.

The Sunday following All Saints Sunday—the second Sunday after Pentecost—is set aside as a commemoration of all locally venerated saints, such as "All Saints of America", "All Saints of Mount Athos", etc. The third Sunday after Pentecost may be observed for even more localized saints, such as "All Saints of St. Petersburg", or for saints of a particular type, such as "New Martyrs of the Turkish Yoke."

In addition to the Sundays mentioned above, Saturdays throughout the year are days for general commemoration of all saints, and special hymns to all saints are chanted from the Octoechos.

In the West

The Western Christian holiday of All Saints Day falls on November 1, followed by All Souls' Day on November 2, and is a Holy Day of Obligation in the Latin Rite Roman Catholic Church.

The origin of the festival of All Saints as celebrated in the West dates to May 13, 609 or 610, when Pope Boniface IV consecrated the Pantheon at Rome to the Blessed Virgin and all the martyrs; the feast of the dedicatio Sanctae Mariae ad Martyres has been celebrated at Rome ever since. The chosen day, May 13, was a pagan observation of great antiquity, the culmination of three days of the Feast of the Lemures, in which the malevolent and restless spirits of the dead were propitiated. Liturgiologists of the Middle Ages based the idea that this Lemuria festival was the origin of that of All Saints on their identical dates and on the similar theme of "all the dead".^[2]

The feast of All Saints, on its current date, is traced to the foundation by Pope Gregory III (731–741) of an oratory in St. Peter's for the relics "of the holy apostles and of all saints, martyrs and confessors, of all the just made perfect who are at rest throughout the world", with the day moved to November 1.^[3]

This usually fell within a few weeks of the Celtic holiday of Samhain, which had a theme similar to that of Lemuria, but which was also a harvest festival. The Irish, whose holiday Samhain had been, did not celebrate All Hallows Day on this November 1 date, as extant historical documents attest that the celebration in Ireland took place in the spring: "...the Felire of Oengus and the Martyrology of Tallaght prove that the early medieval churches [in Ireland] celebrated the feast of All Saints on April 20."^[4]

The festival was retained after the Reformation in the calendar of the Anglican Church and in many Lutheran churches. In the Lutheran churches, such as the Church of Sweden, it assumes a role of general commemoration of the dead. In the Swedish calendar, the observance takes place on the Saturday between October 31 and November 6. In many Lutheran Churches, it is moved to the first Sunday of November. It is also celebrated by other Protestants of the English tradition, such as the United Church of Canada and the Wesleyan Church. [1]

In the United Methodist Church, All Saints' Day is on the first Sunday in November. It is held to remember all those that have passed away from the local church congregation. A candle is lit by the Acolyte as each person's name is called out. Then, a liturgical prayer is offered for each soul in Heaven.

Roman Catholic Obligation

In the Roman Catholic Church All Saints Day is a Holy Day of Obligation. meaning going to Mass on the date is required, however All Saints Day is not considered a Holy Day of Obligation when falling on Monday or Saturday as well as having no obligation at all in Hawaii

Customs

All Saints in Poland

In Portugal and Spain, ofrendas (offerings) are made on this day. In Spain, the play Don Juan Tenorio is traditionally performed. In Mexico, All Saints coincides with the celebration of "Día de los Inocentes" (Day of the Innocents), the first day of the Day of the Dead celebration, honoring deceased children and infants.

In Austria,Belgium, France, Hungary, Italy, Malta, Portugal and Spain people bring flowers to the graves of dead relatives.

In Poland, the Czech Republic, Sweden, Finland, Slovenia, Slovakia, Lithuania, Croatia, Austria, Romania, Hungary and catholic parts of Germany, the tradition is to light candles and visit the graves of deceased relatives.

In the Philippines, this day, called "Undas", "Todos los Santos" (literally "All Saints"), and sometimes "Araw ng mga Namayapa" (approximately "Day of the deceased") is observed as All Souls' Day. This day and the one before and one after it is spent visiting the graves of deceased relatives, where prayers and flowers are offered, candles are lit and the graves themselves are cleaned, repaired and repainted.

In English-speaking countries, the festival is traditionally celebrated with the hymn "For All the Saints" by William Walsham How. The most familiar tune for this hymn is Sine Nomine by Ralph Vaughan Williams.

BACKUP INFO http://en.wikipedia.org/wiki/All_Saints