Answer:
In Canada, everyone fasts for three days, beginning at 6:00 p.m. local time, exactly 72 hours before Hallowe'en actually begins, which is at 6:00 p.m. local time on October 31st.
At 6:00, every light in the country is turned off and we all sit in the dark, and in total silence, until midnight, so that the evil spirits can't find us.
At the stroke of midnight, all the lights come on again. Then we have the biggest feast of the year and we drink large amounts of intoxicating beverages all night long. November 1st is a National Holiday, called "Dominion Recovery Day," but everyone calls it "Hangover Day."