Halloween is on October 31st, the last day of the Celtic calendar. It was originally a pagan holiday, honoring the dead. Halloween was referred to as All Hallows Eve and dates back to over 2000 years ago.
Jack on lantern (Pumpkin lantern) history
In Ireland, where Halloween began, the first jack-o’-lanterns weren’t made of pumpkins. They were made out of rutabagas, potatoes, turnips, or even beets! There is an old Irish legend about a man named Stingy Jack who was too mean to get into heaven and had played too many tricks on the devil to go to hell. When he died, he had to walk the earth, carrying a lantern made out of a turnip with a burning coal inside. Stingy Jack became known as “Jack of the Lantern,” or “Jack-o’-Lantern.”
All these links are copied from here it's a web page made by children in a school of Oviedo, thank you very much to them
All the images taken from internet