Beggars Night, or more properly Beggars' Night, is a regional term for the Halloween-related activity that is referred to in most parts of the United States as "Trick or Treat". Specifically, the term is broadly but not exclusively used in central Ohio, and in many parts of Iowa, Massachusetts, New Hampshire, and western New York.
In the Buffalo area Beggar's Night is October 30 and is a scaled down version of Halloween itself. Mainly kids seeing if they can squeeze an extra night of candy out of the holiday.[1]
In general, Beggars Night represents the "treat" portion of Trick or Treat, where children in costume make evening rounds of homes (and to a lesser extent to businesses during the day) and are given candy. This event being closely tied to, but distinct from, Halloween itself, when various forms of mischief (or "tricks") may occur. (See also Mischief Night.)
The night has often been scheduled by municipal governments on a date prior to the actual Halloween date of October 31.