What are the Jewish celebrations?

Judaism has many holidays and Holy Days. The main holy days are:

1 Rosh Hashanah - The Jewish New Year
2 Yom Kippur - Day of Atonement
3 Sukkot - Feast of Booths (or Tabernacles)
4 Pesach - Passover
5 Shavuot - Feast of Weeks - Yom HaBikurim

The holiest day on the calendar is Shabbat (The Sabbath) which occurs every Friday night at sundown to Saturday night at sundown.

This is a list of most of the major holidays and minor festivals:

1 Rosh Hashanah - The Jewish New Year
2 Aseret Yemei Teshuva - Ten Days of Repentance
3 Yom Kippur - Day of Atonement
4 Sukkot - Feast of Booths (or Tabernacles)
5 Shemini Atzeret and Simchat Torah
6 Hanukkah - Festival of Lights
7 Tenth of Tevet
8 Tu Bishvat - New Year of the Trees
9 Purim - Festival of Lots
10 Pesach - Passover
11 Sefirah - Counting of the Omer
12 Lag Ba'omer
13 Shavuot - Feast of Weeks - Yom HaBikurim
14 Seventeenth of Tammuz
15 The Three Weeks and the Nine Days
16 Tisha B'av - Ninth of Av
17 Rosh Chodesh - the New Month
18 Shabbat - The Sabbath
19 Yom HaShoah - Holocaust Remembrance day
20 Yom Hazikaron - Memorial Day
21 Yom Ha'atzmaut - Israel Independence Day
22 Yom Yerushalaim - Jerusalem Day