So first, I would like to inform everyone that Halloween has only been celebrated in Sweden for the past decade, but has established very fast here, mainly as a marketing ploy..
"The occasion is mainly celebrated by children and teenagers. They go to fancy-dress parties and ghost parties, light lanterns and venture forth into the streets to scare the life out of the neighbourhood. Many pubs and restaurants stage Halloween parties and decorate their premises with fearsome attributes. Halloween has come to stay.
On the island of Öland in the southern Baltic, the arrival of Halloween has led to an upswing in pumpkin growing, and the giant fruits are now quite readily available." ~Sweden.Se
Now a Little on the history of Halloween itself:
"The term Halloween, and its older spelling Hallowe'en, is shortened from All-hallow-even, as it is the evening before "All Hallows' Day" (also known as "All Saints' Day")." ~Wikipedia
"Origin: Celtic observation of Samhain
According to what can be reconstructed of the beliefs of the ancient Celts, the bright half of the year ended around November 1 or on a Moon-phase near that date, a day referred to in modern Gaelic as Samhain ("Sow-in" or alternatively "Sa-ven", meaning: End of the Summer). After the adoption of the Roman calendar with its fixed months, the date began to be celebrated independently of the Moon's phases.
As October 31st is the last day of the bright half of the year, the next day also meant the beginning of Winter, which the Celts often associated with human death, and with the slaughter of livestock to provide meat for the coming Winter. The Celts also believed that on October 31, the boundary separating the dead from the living became blurred. There is a rich and unusual myth system at work here; the spirit world, the residence of the "Sídhe," as well as of the dead, was accessible through burial mounds. These mounds opened at two times during the year, Samhain and Beltane, making the beginning and end of Summer highly spiritually resonant.
The Celts' survival during the cold harsh winters depended on the prophecies of their priests and priestesses (Druids), and the accurate prediction of how much food would be needed to sustain the people before the next harvest. They believed that the presence of spirits would aid in the ability to make predictions about the coming year.
The exact customs observed in each Celtic region differ, but they generally involved the lighting of bonfires and the reinforcement of boundaries, across which malicious spirits might be prevented from crossing and threatening the community.
Like most observances around this season, warmth and comfort were emphasized, indulgence was not. Stores of preserved food were needed to last through the winter, not for parties." ~Wikipedia
Although I am rather lazy and do not wish to write all of that myself, I think it's important for people to know the true origin of the holiday they are celebrating, and so I post it here.