Feast of Unleavened Bread

Passover
A table set up for a Passover Seder.
Official name	Pesach – פסח (in Hebrew).
Observed by	Jews. (In various forms also by: Samaritans; Messianic Jews; Christians, some groups claiming affiliation with Israelites).
Type	Jewish and Samaritan (One of the Three Pilgrimage Festivals), cultural
Significance	Celebrates The Exodus, the freedom from slavery of the Children of Israel from ancient Egypt that followed the Ten Plagues. Beginning of the 49 days of Counting of the Omer Connected to barley harvest in spring.
Celebrations	In Jewish practice, one or two festive Seder meals – first two nights; in the times of the Temple in Jerusalem, the Passover sacrifice. In Samaritan practice, men gather for a religious ceremony on Mount Gerizim that includes the ancient lamb sacrifice (7th day)
Begins	15th day of Nisan
Ends	21st day of Nisan in Israel, and among some liberal Diaspora Jews; 22nd day of Nisan outside Israel among more traditional Diaspora Jews.
2016 date	sunset of Friday 22 April to nightfall of Friday 29 April / Saturday 30 April (7th day)
2017 date	sunset of Monday 10 April to nightfall of Monday 17 April / Tuesday 18 April (7th day)
2018 date	sunset of Friday 30 March to nightfall of Friday 6 April /  Saturday 7 April (7th day)
Related to	Shavuot ("Festival of Weeks") which follows 49 days from the second night of Passover.

Passover or Pesach (/ˈpɛsɑːx, ˈpeɪsɑːx/; from Hebrew פֶּסַח‎ Pesah, Pesakh), is an important, biblically-derived Jewish holiday. Jews celebrate Passover as a commemoration of their liberation by God from slavery in ancient Egypt and their freedom as a nation under the leadership of Moses. It commemorates the story of the Exodus as described in the Hebrew Bible, especially in the Book of Exodus, in which the Israelites were freed from slavery in Egypt. According to standard biblical chronology, this event would have taken place at about 1300 BCE (AM 2450).

Passover is a spring festival which during the existence of the Temple in Jerusalem was connected to the offering of the "first-fruits of the barley", barley being the first grain to ripen and to be harvested in the Land of Israel.

Passover commences on the 15th of the Hebrew month of Nisan and lasts for either seven days (in Israel and for Reform Jews and other progressive Jews around the world who adhere to the Biblical commandment) or eight days for Orthodox, Hasidic, and most Conservative Jews (in the diaspora). In Judaism, a day commences at dusk and lasts until the following dusk, thus the first day of Passover only begins after dusk of the 14th of Nisan and ends at dusk of the 15th day of the month of Nisan. The rituals unique to the Passover celebrations commence with the Passover Seder when the 15th of Nisan has begun. In the Northern Hemisphere Passover takes place in spring as the Torah prescribes it: "in the month of [the] spring" (בחדש האביב Exodus 23:15). It is one of the most widely observed Jewish holidays.