There are many annual events that create the opportunity to dress up in costumes, Christmas, New Year, birthdays, bachelor and World Book Day, among others. Halloween is the most popular event of suit or elegant dress of the year in Western society. Halloween originated centuries ago, the Celts believed that on October 31, the line between the living and the dead became distorted and lost souls who would wreak havoc at night. In defense of the Celts dressed in ghoulish costumes to frighten evil spirits. Within many costume events often present a theme, costumes and outfits often from Hollywood movies like Star Wars, Grease, James Bond and Spider-Man. The themes are also very popular fundraising events, such as the Great Gorilla Run, where 1,000 people dressed as gorillas in London on helping the gorillas Grande, a charity that focuses on species endangered.