Mischief Night is an informal holiday on which certain children and teens engage in pranks and minor vandalism.
The earliest reference to Mischief Night is from 1790 when a headmaster encouraged a school play which ended in "an Ode to Fun which praises children's tricks on Mischief Night in most approving terms". In the United Kingdom, these pranks were originally carried out as part of May Day celebrations, but shifted to later in the year, dates varying in different areas, some marking it on October 30, the night before Halloween, others on November 4, the night before Bonfire Night. According to one historian, "May Day and the Green Man had little resonance for children in grimy cities. They looked at the opposite end of the year and found the ideal time, the night before the gunpowder plot." However, the shift only happened in the late nineteenth century and is described by the Opies as "one of the mysteries of the folklore calendar". In Germany, Mischief Night is still celebrated on May 1.
In the United States, Mischief Night is commonly held on October 30, the night before Halloween. The separation of Halloween tricks from treats seems to have only developed in certain areas, often appearing in one region but not at all nearby. In New Jersey's Atlantic, Bergen, Burlington, Camden, Cape May, Cumberland, Essex, Gloucester, Hudson, Mercer, Middlesex, Monmouth, Morris, Ocean, Passaic, Somerset, Sussex, Warren, and Union counties, as well as in Philadelphia; Delaware; Westchester County, New York; and Fairfield County, Connecticut, it is referred to as "Mischief Night" or "Devil's Night". In some towns in Northern New Jersey and parts of New York State, it is also known as "Goosey Night". Meanwhile, in Baltimore, Maryland it has traditionally been referred to as "Moving Night".