The Torah states that this day has been given to us for atonement of sins (Leviticus 16:30, referring to Yom Kippur). On that day, we fast and pray and beg God to forgive us for all sins which we committed during the year, whether intentionally or not.
Our tradition is that the ten days from Rosh Hashanah until Yom Kippur are when the world and its inhabitants are judged for that year (Talmud, Rosh Hashanah 16a and 18a).
Jews in California celebrate Yom Kippur the same way that Jews the world over celebrate Yom Kippur.
Yom Kippur
The Jews celebrate Yom Kippur and Hanukkah.
Jews
Jews don't have churches - they have synagogues, and yes, they go to synagogue during Yom Kippur.
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The holiday in question is YOM KIPPUR.
Jews observe the holiday of Yom Kippur, a 25 hour fast with no food or water and a day of prayer.
Yom Kippur also known as the days of Atonement is the holiest day of the year for Jews .
Yom Kippur is the day of atonement where Jews ask HaShem to forgive their mistakes of the previous year.
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The Day of Atonement is Yom Kippur (Leviticus ch.23). This is the holiest day in Judaism and the day where even secular Jews attend synagogue. On Yom Kippur, Jewish people fast from all food and drinks for a complete 25hrs, starting just before sunset the previous day.