Yom Kippur, or the “Day of Atonement”, is the holiest day on the Jewish Calendar. For devout Jews in Canada and around the world, Yom Kippur is the most important Holiday, beyond Hanukkah or even the Passover. Many Jews will spend the entire day in fasting, praying and other observances.
In 2021 Yom Kippur begins at sundown on September 15, and ends at nightfall on September 16. (This is according to the Gregorian Calendar, while the Jewish Calendar is at year 5782.)
Find out more:
What is Yom Kippur? (Chabad.org)