There are important parallels between Jewish feasts and the fulfillment of Christ. For example the Passover is now celebrated as the Lord's Supper.
The Sabbath is now celebrated by the Resurrection.
Some other parallels are:
Pesach / Passover
Hag HaMatzah / Feast of Unleavened Bread
Bikkurim / First Fruits
Shavout / Feast of Weeks (Pentecost)
Jewish tradition holds that Rosh Hashanah celebrates the anniversary of the creation of the world, a day when "God takes stock of all of His Creation," which of course includes all of humanity. Translated from the Hebrew, Rosh Hashanah means "head of the year" - rosh means head, while hashanah means year. Jews believe that God's judgment on this day determines the course of the coming year.
Rosh Hashanah is a Jewish festival in which most work ceases, just as on the weekly Sabbath. It's celebrated both in joy and solemnity. During the daily prayer service a ram's horn, or in the Hebrew, shofar, is sounded:
"And the LORD spake unto Moses, saying, Speak unto the children of Israel, saying, In the seventh month, in the first day of the month, shall ye have a sabbath, a memorial of blowing of trumpets, an holy convocation. Ye shall do no servile work therein: but ye shall offer an offering made by fire unto the LORD." (Leviticus 23:23-25)