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, the boundaries between the worlds of the living and the dead overlapped and the deceased would come back to life and cause havoc such as sickness or damaged crops. The festivals would frequently involve bonfires, where the 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.When the Romans occupied Celtic territory, several Roman traditions were also incorporated into the festivals. Feralia, a day celebrated in late October by the Romans for the passing of the dead as well as a festival which celebrated the Roman Goddess Pomona, the goddess of fruit were incorporated into the celebrations. The symbol of Pomona was an apple, which is a proposed origin for the tradition of bobbing for apples on Halloween.
Halloween is very popular in Ireland, where it is believed to have originated, and is known in Irish as Oíche Shamhna, literally "Samhain Night". Pre-Christian Celts had an autumn festival, Samhain, "End of Summer", a pastoral and agricultural "fire festival" or feast, when the dead revisited the mortal world, and large communal bonfires would hence be lit to ward off evil spirits.
On Halloween night in present-day Ireland, adults and children dress up as creatures from the underworld (e.g., ghosts, ghouls, zombies, witches and goblins), light bonfires, and enjoy spectacular fireworks displays, despite the fact that such displays are usually illegal. It is also common for fireworks to be set off for the entire month preceeding Halloween, as well as a few days after. Halloween was perceived as the night during which the division between the world of the living and the otherworld was blurred so spirits of the dead and inhabitants from the underworld were able to walk free on the earth. It was believed necessary to dress as a spirit or otherworldly creature when venturing outdoors to blend in, and this is where dressing in such a manner for Halloween comes from. This gradually evolved into trick-or-treating because children would knock on their neighbours' doors, in order to gather fruit, nuts, and sweets for the Halloween festival. Salt was once sprinkled in the hair of the children to protect against evil spirits.
In places of Ireland, huge bonfires are lit. Young children in disguise are gladly received by the neighbors with "fruit, miniature chocolate bars, loose change, peanuts and of course sweets" for the "Halloween Party", whilst older male siblings play innocent pranks on their bewildered victims. Some homes will put up decorations including Halloween lights. Since schoolchildren have the week off for Halloween, it is common for teenagers and college students to spend weeknights out with friends pranking and causing mischief, if not trick-or-treating themselves.
