Pesach (or Passover)  is the Jewish Holiday that commemorates the Exodus from Egypt and the beginning of spring, during which observant Jews abstain from leavened bread. It begins at sundown with a seder, an elaborate and long ritual meal, often lasting until midnight. Many hold seders on both the first and second nights of the holiday. (The practice of "Counting the Omer" - enumerating the 49 days of the 7 weeks between Pesach and Shavuot - is begun on the second night.)

 

Passover lasts for 7 or 8 days in the diaspora.