What is the Feast of All Saints' Day? Part 1

All Saints' Day, also known as All Hallows' Day, the Feast of All Saints, the Feast of All Hallows, the Solemnity of All Saints, and Hallowmas, is a Christian solemnity celebrated in honor of all the saints of the Church. Whether they are known or unknown.^[3^[4]^[5^[6^[6^[6]^[7^{[7][8][9][10]}

All-Saints by Fra Angelico

From the 4th century, feasts commemorating all Christian martyrs were held in various places,^[3] on various dates near Easter and Pentecost. In the 9th century, some churches in the British Isles began holding the commemoration of all saints on 1 November, and in the 9th century this was extended to the whole Catholic Church by Pope Gregory IV.^[11]

In Western Christianity, it is still celebrated on 1 November by the Roman Catholic Church as well as many Protestant churches, such as the Lutheran, Anglican, and Methodist traditions.^[7] The Eastern Orthodox Church and associated Eastern Catholic and Eastern Lutheran churches celebrate it on the first Sunday after Pentecost.^[12] The Syro-Malabar Church and the Chaldean Catholic Church, both of which are in communion with Rome, and the Church of the East, celebrate All Saints' Day on the first Friday after Easter Sunday.^[13] In the Coptic Orthodox tradition, All Saints' Day is on Nayrouz, celebrated on 11 September. The day is the start of the Coptic new year, and of its first month, Thout.^[14]

Flowers deposited on All Saints' Day in tombs in the cemetery of Cambados, Spain - Image By juantiagues - Cambados-Ruinas de Santa Mariña03, CC BY-SA 2.0, https://commons.wikimedia.org/w/index.php?curid=41954338Liturgical celebrations

In the Western Christian practice, the liturgical celebration begins with its first vespers on the evening of 31 October, All Hallows' Eve (All Saints' Eve or “Halloween”), and ends at the compline of 1 November. It is thus the day before All Souls' Day, which commemorates the faithful departed. In many traditions, All Saints' Day is part of the season of Allhallowtide, which includes the three days from 31 October to 2 November inclusive, and in some denominations, such as Anglicanism, extends to Remembrance Sunday.^[15][16][3] In places where All Saints' Day is observed as a public holiday, but All Souls' Day is not. Cemetery and grave rituals such as offerings of flowers, candles, and prayers or blessings for the graves of loved ones often take place on All Saints' Day.^{[17][18][19][20]} In Austria and Germany, godparents gift their godchildren Allerheiligenstriezel (All Saint's Braid) on All Saint's Day,^[21] while the practice of souling remains popular in Portugal.^[22] It is a national holiday in many Christian countries.

The Christian celebration of All Saints' Day and All Souls' Day stems from a belief that there is a powerful spiritual bond between those in heaven (the “Church triumphant”, the living (the “Church militant”), and the “Church penitent” which includes the faithful departed). In Catholic theology, the day commemorates all those who have attained the beatific vision in Heaven. In Methodist theology, All Saints' Day revolves around giving God solemn thanks for the lives and deaths of his saints, including those who are famous or obscure. Individuals throughout the Church Universal are honored, such as Paul the Apostle, Augustine of Hippo and other saints, varying according to the hagiographic traditions of the Church in question.^[23 In some traditions, the day is also used to celebrate individuals who have personally led one to faith in Jesus, such as one's grandmother or friend.^[23]

source: https://en.wikipedia.org/wiki/All_Saints%27_Day

All Hallows' Day, Hallowmas, and the Solemnity of All Saints.

All the faithful departed who are in heaven.

All then Christians who are currently living on Earth.