Conversation so far:
which jewish festival remembers camping in the desert
Sukkot commemorates the years that the Jews spent in the desert on their way to the Promised Land, and celebrates the way in which God protected them under desert conditions.
what is another jewish holiday besides sukkot
Yom Kippur, also known as the Day of Atonement, is the holiest day of the year in Judaism.

Question: why
Self-contained rewrite: why is yom kippur the holiest day of the year in judaism