Chol HaMoed
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Chol HaMoed, a Hebrew phrase which means "weekdays of the festival", refers to the intermediate days of Passover, or Sukkot. During Chol HaMoed the usual Yom Tov restrictions are relaxed, but not entirely eliminated.[1] Hallel and Mussaf prayers must be said on these days, as on Yom Tov.
Passover is a seven-day festival (eight in the Diaspora), of which days second though sixth (third though sixth in the Diaspora) are Chol HaMoed. Sukkot is a seven-day festival, of which days second though seventh (third though seventh in the Diaspora) are Chol HaMoed.
On Chol HaMoed, tefillin are not worn during the prayers by all except certain groups of Ashkenazim, and even those lay tefillin without a blessing.
On these days there are four aliyot at the Torah reading in synagogue.