All Saints' Day a holy day of obligation
All Saints' Day a holy day of obligation is held on November 1. A national holiday in many historically Catholic countries. And its related observance: Day of the Innocents, The first day of Day of the Dead or El Dia de los Muertos celebration. - Mexico, Haiti. This event in the first decade of the month November is annual. 
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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. On the Solemnity of All Saints, November 1, the Church celebrates those Christians who achieved spiritual maturity. It is a day to venerate all the holy men and women who have been canonized by the Church.
In 609 A.D., under Pope Boniface IV, the first All Saints' Day is celebrated on May 13. He dedicated the Pantheon to the Virgin Mary and the Martyrs. In 837 A.D., Pope Gregory III made All Saints' Day a holiday on November 1. It officially became a holy day of obligation under King Louis the Pious.
Similar holidays and events, festivals and interesting facts
Nevada Statehood Day on October 31
Girl Scouts Founder's Day on October 31 (United States);
National Caramel Apple Day and Candy Apple Day in USA on October 31
P&G Day on October 31 (The Procter & Gamble Company);
Allhallowtide on October 31 (The first day of Allhallowtide, observed until November 6 in Western Christianity);
Reformation Day on October 31 (Slovenia, parts of Germany, Chile, El Salvador, Dominican Republic, various Protestant churches with a particular emphasis in Lutheran and Reformed ones);
World City Day on October 31
National Day of Evangelical and Protestant Churches in Chile on October 31 (Día Nacional de las Iglesias Evangélicas y Protestantes);
U.S.V.I. Liberty Day on November 1
National Brush Day on November 1 (United States);
National Pâté Day and National Vinegar Day in USA on November 1
Authors' Day in USA on November 1
National Medical Science Liaison Awareness and Appreciation Day in USA on November 1
National Cook for Your Pets Day in US on November 1
National French Fried Clam Day in USA on November 1
National Sushi Day in USA on November 1
Global Love Your Lawyer Day on November 1 (Held on the first Friday of November);
Santa Muerte on November 1 (Folk Catholicism, Mexico and Southwestern United States);
Day of the Dead in Mexico on November 1 (celebrated until November 2);
World Ecology and Ecologists Day on November 1
Statehood Day in North Dakota and South Dakota on November 2
National Bison Day in United States on November 2 (Celebrated on the first Saturday in November);
All Souls' Day on November 2 (Roman Catholic Church and Anglican Communion);
National Deviled Egg Day in USA on November 2
Traffic Directors Day on November 2
Look for Circles Day on November 2
All Saints Day on November 2 (Celebrated on Saturday between October 31 and November 6 in Finland, Sweden, El Salvador);
Day of the Dead on November 2 (the second day of Day of the Dead or El Dia de los Muertos celebration in Mexico);
Day of the Dead in Guatemala, Honduras and El Salvador on November 2
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