what is the tradition behind this holiday in Canada?
What is usually eaten on that day, and are there any
other celebration traditions that accompany this holiday?

are turkey and pumkin pie usually part of the feast?
Is it basically a harvest festivity?

In the U.S. i think there is a football game and a parade

for me, the meal always included Tofurkey, a vegetarian dish.

and a recipe for cranberry sauce which comes from an NPR radio host.
Susan Stamberg,whose other0-in-law had this awesome concoction
with horseradish, sour cream and cranberries...you'd never believe
it was so delicious!!   

Chongo might like this recipe and instructions by a monkey
http://www.himonkey.net/cooking/stamberg/