Yes, Shavuot is a Jewish holy day/festival (Leviticus ch.23).
Sabbath, Pesach, Shavuot, Rosh Hashanah, Yom Kippur, and Sukkoth.
Hanukkah is a Jewish celebration:http://judaism.answers.com/jewish-holidays/hanukkah
The Shavuot celebration originated in Israel and they celebrate a feast.
Shavuot is a Jewish religious holiday.
All three of the major Jewish festivals are related to harvest (especially Sukkot). Passover is a thanksgiving to God for the Exodus and the annual barley-harvest, Shavuot is a thanksgiving to God for the Giving of the Torah and the annual wheat-harvest, and Sukkot is a thanksgiving to God for the yearly ingathering of grain.See also the Related Link.The Jewish festivals
In Christianity, the holiday known as Shavuot is called 'Pentecost.' While Jews celebrate God Giving them the Torah on Shavuot, Christians celebrate God Sending them the Holy Spirit on Pentecost.
Yes
Jewish culture
It originated in the Jewish religion.
People who celebrate Kwanzaa are African American.
Jewish New Year
In their homes.