The Jewish Holidays
The Jewish day begins and ends at sundown; so all Jewish holidays begin at sundown of the day preceding the date shown in most calendars (including ours).
Jewish law does not recognize gradations of importance among "holy days"—those holidays, or portions of holidays, when Jewish law prohibits work or travel.
However, Jews who do not observe all holy days are most likely to be at synagogue or home celebrations—and abstain from work—
on Rosh Hashanah, Yom Kippur, Passover,
and the weekly Sabbath.
Photo of a Sukkah—the temporary dwelling in which Jewish families traditionally celebrate
the week-long harvest festival of Sukkot.
About the Jewish holidays (brief descriptions)
Hebcal Interactive Jewish Calendar (candle-lighting times, holiday dates, etc.)