Who is exempt from dwelling in a Sukkah and why? • While engaged in fulfilling a mitzvah, may one switch to another? • Other than Tefillin, a mourner on the first day is obligated to fulfill most mitzvos - why isn't this obvious? • A mourner is not obligated to suffer • Why are a groom and his revelers exempt from Sukkah? • Why is an orchard watchman exempt from Sukkah?