Halloween’s roots are the Celtic festival known as Samhain; from the Old Irish samain). Of interest, All Saint’s Day was created by the Catholic Church to attract Pagans to the Christian alternative. 
Top 100 Halloween Movies- A list at IMBD. My wife and my favorites are Hocus Pocus (1993) and Sleepy Hallow (1999).
Pumpkins
Native to North America (northeastern Mexico and southern United States), pumpkins are one of the oldest domesticated plants, having been used as early as 7,500 to 5,000 BC. Pumpkins are widely grown for commercial use and are used both for food and recreation
The origins of Halloween:
ALL HALLOW’S EVE
Halloween is shortened from “All-hallow-evening,” the eve of All Hallow’s Day, which is now known as All Saints Day. (All Saints Day became was placed on November 1 by Pope Gregory IV in 835; All Souls Day on November 2 in 998.) Millions of children celebrate Halloween each year with costumes, parties, and hi-jinks. But what are they celebrating? Where did these customs arise?
Halloween has its origins in the ancient Celtic festival known as Samhain; from the Old Irish samain). The festival of Samhain is a celebration of the end of the harvest season in Gaelic culture, and is sometimes regarded as the "Celtic New Year". Traditionally, the festival was a time used by the ancient pagans to take stock of supplies and slaughter livestock for winter stores. The ancient Gaels believed that on October 31, now known as Halloween, the boundary between the alive and the deceased dissolved, and the dead become dangerous for the living by causing problems such as sickness or damaged crops. The festivals would frequently involve bonfires, into which bones of slaughtered livestock were thrown. Costumes and masks were also worn at the festivals in an attempt to mimic the evil spirits or placate them.
In pagan times, October 31 was New Year's Eve, a night of evil and terror when all hell broke lose. Goblins and ghosts were abroad that night, while witches celebrated their black rites as the spirits and souls of the dead roamed the earth. To frighten the evil spirits and to bolster their own sagging spirits, our ancestors created a din with bells, horns, pots and pans, (just as we still do at midnight on December 31st), and built fires to frighten the witches or perhaps burn them if they might get caught. On the afternoon of October 31st, village boys would go from house to house collecting fuel for the midnight fires. Everyone was expected to contribute some peat or "coal pieces" to help burn the witches. Those who did not received dire warnings of the evil consequences that might follow.
Over 1,000 years ago Christians confronted these pagan rites of appeasing the lord of death and evil spirits. But the early Christians didn't simply speak out; they tried to institute a Christian alternative. All Hallow's Day (November 1) was a celebration of all "the holies" – those people who had died faithful to Christ
HOW THE TRADITION OF TRICK OR TREATING GOT STARTED
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Trick or Treating
As for the trick or treating, or “guising” (from “disguising”), traditions, beginning in the Middle-Ages, children and sometimes poor adults would dress up in the aforementioned costumes and go around door to door during Hallowmas begging for food or money in exchange for songs and prayers, often said on behalf of the dead. This was called “souling” and the children were called “soulers”.
UK
Souling ultimately gave rise to guising in the U.K. starting in the 19th century, with children dressing up and begging for things like fruit and money. In order to earn this token, they’d often tell jokes, sing songs, play an instrument, recite a poem, or perform in some other way for the amusement, not unlike the old tradition of souling but instead of prayers, a performance was offered.
USA
The practice of guising made its way to North America, probably brought over by the Scottish and Irish in the late 19th or early 20th century (first documented reference in 1911).
Trick or treating instead of guising on Halloween popped up in North America in the 1920s and 1930s, first in the western half of the continent. The term and the practice slowly spread, with a brief respite during WWII. After the WWII sugar rations were lifted, Halloween’s popularity saw a huge spike and within five years trick or treating was a near ubiquitous practice throughout North America.
Top 100 Halloween Movies- A list at IMBD. My wife and my favorites are Hocus Pocus (1993) and Sleepy Hallow (1999).
Native to North America (northeastern Mexico and southern United States), pumpkins are one of the oldest domesticated plants, having been used as early as 7,500 to 5,000 BC. Pumpkins are widely grown for commercial use and are used both for food and recreation
The origins of Halloween:
ALL HALLOW’S EVE
Halloween is shortened from “All-hallow-evening,” the eve of All Hallow’s Day, which is now known as All Saints Day. (All Saints Day became was placed on November 1 by Pope Gregory IV in 835; All Souls Day on November 2 in 998.) Millions of children celebrate Halloween each year with costumes, parties, and hi-jinks. But what are they celebrating? Where did these customs arise?
Halloween has its origins in the ancient Celtic festival known as Samhain; from the Old Irish samain). The festival of Samhain is a celebration of the end of the harvest season in Gaelic culture, and is sometimes regarded as the "Celtic New Year". Traditionally, the festival was a time used by the ancient pagans to take stock of supplies and slaughter livestock for winter stores. The ancient Gaels believed that on October 31, now known as Halloween, the boundary between the alive and the deceased dissolved, and the dead become dangerous for the living by causing problems such as sickness or damaged crops. The festivals would frequently involve bonfires, into which bones of slaughtered livestock were thrown. Costumes and masks were also worn at the festivals in an attempt to mimic the evil spirits or placate them.
In pagan times, October 31 was New Year's Eve, a night of evil and terror when all hell broke lose. Goblins and ghosts were abroad that night, while witches celebrated their black rites as the spirits and souls of the dead roamed the earth. To frighten the evil spirits and to bolster their own sagging spirits, our ancestors created a din with bells, horns, pots and pans, (just as we still do at midnight on December 31st), and built fires to frighten the witches or perhaps burn them if they might get caught. On the afternoon of October 31st, village boys would go from house to house collecting fuel for the midnight fires. Everyone was expected to contribute some peat or "coal pieces" to help burn the witches. Those who did not received dire warnings of the evil consequences that might follow.
Over 1,000 years ago Christians confronted these pagan rites of appeasing the lord of death and evil spirits. But the early Christians didn't simply speak out; they tried to institute a Christian alternative. All Hallow's Day (November 1) was a celebration of all "the holies" – those people who had died faithful to Christ
HOW THE TRADITION OF TRICK OR TREATING GOT STARTED

How the Tradition of Trick or Treating Got Started
Amit Bhatnagar asks: Where did the American tradition of trick or treating come from? The vast majority of the traditions commonly associated with Halloween today are borrowed or adapted from four different festivals, namely: The Roman Feralia festival, commemorating the dead The Roman Pomona...
Trick or Treating
As for the trick or treating, or “guising” (from “disguising”), traditions, beginning in the Middle-Ages, children and sometimes poor adults would dress up in the aforementioned costumes and go around door to door during Hallowmas begging for food or money in exchange for songs and prayers, often said on behalf of the dead. This was called “souling” and the children were called “soulers”.
UK
Souling ultimately gave rise to guising in the U.K. starting in the 19th century, with children dressing up and begging for things like fruit and money. In order to earn this token, they’d often tell jokes, sing songs, play an instrument, recite a poem, or perform in some other way for the amusement, not unlike the old tradition of souling but instead of prayers, a performance was offered.
USA
The practice of guising made its way to North America, probably brought over by the Scottish and Irish in the late 19th or early 20th century (first documented reference in 1911).
Trick or treating instead of guising on Halloween popped up in North America in the 1920s and 1930s, first in the western half of the continent. The term and the practice slowly spread, with a brief respite during WWII. After the WWII sugar rations were lifted, Halloween’s popularity saw a huge spike and within five years trick or treating was a near ubiquitous practice throughout North America.
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