They High Holy Days are Rosh Hashanah and Yom Kippur. They and Passover are Jewish holidays, originating in the Torah (Leviticus ch.23), on which no work is to be done (ibid). Other than that, their details are different. See also:
http://judaism.answers.com/jewish-holidays/the-jewish-holidays
They are extra special holidays.
the passover
passover
Christmas..Easter..Passover
High Holy Days - band - was created in 1998.
Passover is a Jewish holiday. Holy week is a Christian event.
49 The seventh Sunday after Easter, commemorating the descent of the Holy Spirit upon the disciples.
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Mass
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No, the feast days remain the same date from year to year. Only the lenten season, Holy Week and Easter season change as they are based on the Jewish Passover.