From Wikipedia'Trick-or-treating resembles the late medieval practice of souling, when poor folk would go door to door on Hallowmas (November 1), receiving food in return for prayers for the dead on All Souls Day (November 2).'
Admittedly, it is from Wikipedia so...you know.
(,
Sat 31 Oct 2009, 13:16,
archived)
Admittedly, it is from Wikipedia so...you know.