Yom Kippur will be observed this year from sundown October 3 – sundown October 4.
Yom Kippur (Hebrew:יוֹם כִּפּוּר , IPA: [ˈjɔm kiˈpur]), also known in English as the Day of Atonement, is the most solemn and important of the Jewish holidays. Its central themes are atonement and repentance. Jews have traditionally observed this holiday with a 25-hour period of fasting and intensive prayer.
Sukkot, Feast of Tabernacles will be observed from sundown October 8 - sundown October 15.
Sukkot (Hebrew: סוכות or סֻכּוֹת, sukkōt ; "booths", also known as Succoth, Sukkos, Feast of Booths or Feast of Tabernacles), is a Biblical pilgrimage festival that occurs in autumn on the 15th day of the month of Tishri (late September to late October). The holiday lasts 7 days.
The word Sukkot is derived from the Hebrew word sukkah, meaning booth or hut. During this holiday, Jews are instructed to build a temporary structure in which to eat their meals, entertain guests, relax, and even sleep. The sukkah is reminiscent of the type of huts in which the ancient Israelites dwelt during their 40 years of wandering in the desert after the Exodus from Egypt, and is intended to reflect God's benevolence in providing for all the Jews' needs in the desert.