The fast is just a part of the process of atonement during the holiday of Yom Kippur. The process also includes praying, asking HaShem (The Creator) and people to forgive the mistakes made in the previous year, and resolving to not repeat these mistakes.
It's assumed that HaShem accepts all honest apologiese. If a person refuses to forgive after three honest attempts to apologise, it's considered that the person seeking forgiveness are forgiven for their actions.
Jews begin fasting at sundown, which - as each day starts with sunset according to the Hebrew calendar - is the start of Yom Kippur. For me, that'll be 18.55.
Praying for God's forgiveness and fasting.
Jews in California celebrate Yom Kippur the same way that Jews the world over celebrate Yom Kippur.
Yom Kippur
Fasting, and prayer in the synagogue.
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.
It is celebrated in a synagogue and people pray for God's forgiveness for the mistakes they made in the previous year. Additionally, Yom Kippur is a biblical fast day, this means that Jews fast for 25 hours with no food or water.
No.
The holiday in question is YOM KIPPUR.
Yom Kippur.