They don't "need" holy days, they have them just like almost all religions but they are not strictly speaking necessary. Christians' holy days aren't necessary.
What to you mean by "need"?
as in why do they practice them or what is the point?
See the attached Related Link.
See the attached Related Link.
A couple of examples: they need to pray in the morning and to have a vacation on their holy days.
They brought them together by bringing together the jews on the most holy days. They did this because in the jews religion during those holidays god watches over them and they have to try to erase all there bad sins so that they don't die that day.
The High Holy Days of Rosh Hashanah and Yom Kippur are celebrated by Jews because God commands us to celebrate them (Leviticus ch.23).
.Going to the Synagogue. .Praying to G-d. .Reading from, for example, the Torah. .Celebrating their Holy Days, such as Yom Kippur and Pesach. .They fast on some Holy Days, such as Yom Kippur.
No, not a whole month, but many days of observances, like Hanukkah, or Yom Kippur
channukah, yom kippor, rosh hashanah and more...
Sikhs and Jews do not share any of the same holy books.
Jerusalem is considered holy by Muslims, Jews, and Christians.
no , but remember them on that day.
The sabbath!