PASSOVER

Passover, or Pesach, begins during the full moon in the first month of the year, namely on the 14th day of Nisan. Passover is called the "feast of freedom" since it celebrates the Exodus of the Israelites from bondage in Egypt and memorializes the night when the faithful were protected by the blood of the lamb - a clear picture of the sacrifice of Yeshua the Messiah, the Lamb of God who takes away the sins of the world. Passover is an eight day springtime holiday observed from Nisan 15 through Nisan 22, which usually occurs in March/April on the Gregorian calendar.

Excerpts taken from hebrew4christians.com

PENTECOST

The festival of Shavuot ("Weeks, "Pentecost"") marks the culmination of the redemption, sometimes called Atzeret Pesach (עצרת פסח), or "the Gathering rally of Passover." Since the Exodus from Egypt was intended to lead to the revelation of Sinai, the goal of Passover is the giving of the Torah to the Jewish people. God took the Jews out of Egypt so that they would be His own treasured people, holy and separated from the pagan cultures around them. Indeed, all of the holidays are connected with this event, including the fall festivals of Rosh Hashanah, Yom Kippur and Sukkot.

Excerpts taken from hebrew4christians.com

TABERNACLES

The seventh (and final) festival given to Israel is called Sukkot (סֻכּוֹת) or the "Feast of Tabernacles." Sukkot is observed in the fall, from the 15th to the 22nd of Tishri. During this time many Jewish families construct a sukkah (סֻכָּה), a small hastily built hut in which meals are eaten throughout the festival. The sukkah is used to remember the huts [plural: sukkot] Israel lived in during their 40 year sojourn in the desert after the exodus from Egypt.

Excerpts taken from hebrew4christians.com