The idea of letting children have a “lawless night” originated in England, and was often celebrated on May Day Eve (April 30) or on Halloween. But in the mid-17th century, when Guy Fawkes Day (November 5) became a national holiday, Guy Fawkes Eve became the most popular night for mischief in England, Australia, and New Zealand, where it is sometimes called Mischievous Night or Danger Night. Discuss
Source: The Free Dictionary