Here's a good little bit from the Net about Devil's night:

>>particular day of the year, but that the vast majority (70.38%) have no special word for it.

The night before Halloween, known in some areas as "Mischief Night", "Gate Night", "Cabbage Night", "Goosie Night (Goosy,Goosey)" or "Devil's Night," is often associated with pranks or destructive activities performed by adolescents. Some of the acts range from minor vandalism to theft, or even arson. Many youths involved in mischief night would be considered too old for traditional trick-or-treating. The most common wrong-doing is toilet papering or "T.P.ing", in which people's houses, lawns, and trees are covered in toilet paper streamers.

Perhaps the most elaborate example of a Mischief Night prank was Orson Welles' radio dramatization of The War of the Worlds, originally aired on October 30, 1938. Welles' broadcast, which purported to be a live newscast detailing the invasion of the United States by Martians, was accepted as real by many listeners and created a public panic in some areas of the country.

A dialect survey begun in 1999 by Harvard University indicates that there are a number of terms for this "Mischief Night"<<<