Source legend 1,
The Celtic believed that the sun god helped them grow crops. However, every year, the sun god is attacked by an evil force named Samhain and imprisoned for six months. Samhain, also known as "Lord of Dead" and "Prince of Darkness", brought cold and dark winters to the land of the Celts.
The Celts were very afraid of the night of1October 3 1 Sunday, because they felt that there were a bunch of evil souls lurking anywhere that night. They make a fire at home to let those evil spirits leave their home (there is a sentence in the last untranslated paragraph that flames can scare away ghosts). They believe that Samhain called the dead out, and they also believe that Samhain will turn the dead into something else, like a cat. The Celts will put on a terrible disguise to drive away those evil souls. (This is the prototype of Halloween.) After Rome occupied the land of the Celts, Roman festivals were combined with the Samhain Festival of the Celts1October 3 1 day, which became the present Halloween.
Source legend 2,
More than two thousand years ago, the Catholic Church in Europe designated 1 1 month 1 day as "ALL HALLOWS DAY". "HALLOW" means saint. Legend has it that since 500 BC, CELTS living in Ireland, Scotland and other places moved this festival forward by one day, that is,1October 3 1 day. They think that this day is the day when summer officially ends, that is, the beginning of the new year and the beginning of the harsh winter.
Whenever Halloween comes, children can't wait to put on colorful make-up clothes, put on strange masks, carry a "Jack-o-lantern" and go around asking adults for holiday gifts. These are the most well-known symbols of Halloween-the strange "jack-o'-lantern" and the practical joke of "performing magic or giving candy".