Correction exposé d'anglais

Bonjour,
Je travaille sur un exposé d'anglais. Mon sujet est l'histoire d'Halloween. Je voulais savoir si quelqu'un pourrait me corriger mes fautes ? Merci

As you know, tomorrow evening begins the night of Halloween. Everyone know what is it. When we think about this festival we immediately think of costume parties, pumpkins, monsters, haunted houses and of course candies. But the majority of people doesn’t know exactly where Halloween comes from and why it is celebrated. That is why I am going to explain to you the Halloween history.

Everything begins about 2500 years ago with Celtic and Gaul people. Halloween comes from an ancient Celtic festival known as “Samhain”. This word means in gaelic “the end of summer” or “weakening”. But the festival of Samhain was more a festival of the dead.
It celebrated the beginning of the new year on the night of october 31 to november 1. On this new’year eve the boundary between the alive and the deceased dissolved. We celebrated the travel in the other world dead of the year. The legend tells dead people came back from the dead and the alive received them. But evil spirits could also come back. That is why the alive dressed up in dead people to placate the evil spirits being like them. Turnips, which later will be replaced by pumpkins, was cut in horrible faces to represanted the wandering soul. Thus of this ancient festival of Saimhain we can recognized the tradition of costume parties and pumpkins.

In the 8th century, friars evengilized the people and tried to eradicate all pagan festivals. For Samhain, the Church established on the same date a christian festival. They moved the old Christian feast of All Saints' Day from May 13 to November 1st. So doing this the Church replaced spirits of all dead by only spirits of saints. Little by little all the western countries adopted the date of november 1 to celebrate the festival of all saints forgoting the festival of Samhain exepted for Irish people.

Ireland was the only country which continued to celebred the Samhain but the festival wasn’t called like this any more. The word of Samhain changed in a word more christian and became all hollows’ even, that is Halloween. Because the october 31 became the eve of "All Hallows' Day" as All Saints' Day.
In the 17th century, a huge starvation came in Ireland. People had to go so most irish people immigrated to North America taking with them versions of the Halloween. It was on the 20 century that american made the most of Halloween selling costumes, decorating… They transformed this festival in a festival to children. Treack-or-treat, to collect candy under funny duress of whammy, began.

Until 90’s Halloween was unknown by most of French because they forgot the festival of Samhain for several centuries. American Industries established in France like Disney, Mc Donald, Coca-cola saw a great opportunity in Halloween. They was the first to speak of Halloween in France. That is why Halloween is now seen like a huge American commercial festival. And maybe it is beacause of it that the succes of Halloween decreases for few years.
But I would like to remember you that Halloween come from France and Ireland and not United States. So it isn’t used for nothing to boycott it because it is a good reason to have a good time.