More information: In the past, Jews commemorated Passover by sacrificing a paschal lamb, roasting its flesh and proceeding to eat it.
Answer: 15th day of Nisan
More information: Passover always begins on the 15th day of Nisan. This is the Jewish year's first month.
Answer: The arrival of the Israelites to the Red Sea
More information: The last day of the Passover celebrates the arrival of the Israelites (who had successfully escaped slavery in Egypt) to the Red Sea. It's noteworthy to mention that upon getting to the Red Sea, Moses miraculously parted it for the Israelites to get across. During the last day of Passover, women and girls customarily light candles in commemoration of that great event.
More information: The Jewish text of Haggadah is always recited by the gathering at the Passover Seder. The Haggadah, which translates to "telling" in the Hebrew language, recounts the tale of the Israelites journey to freedom from slavery in Egypt.
More information: Matzah is the name of the unleavened bread Jews eat during Passover. This symbolizes the fact that during the Israelites' escape from Egypt to the Promised Land, they left so quickly that they didn't have sufficient time to wait for their dough to rise.
More information: An empty chair is often left at the Passover Seder table for Prophet Elijah. This empty seat is traditionally at the head of the table. In addition to this seat, a cup of wine is placed untouched at the table for Elijah. Based on the teachings of Judaism, it is believed that someday, Prophet Elijah will take his sit on that empty chair and announce the arrival of King Messiah (also known as Moshiach in Hebrew).
Answer: The exodus/freedom of Jews from slavery in Egypt.
More information: Passover commemorates how Moses safely and successfully led the Jews out of Egypt, where they had spent centuries living in slavery under various Egyptian Pharaohs.
Answer: 14th day of Iyar
More information: The Second Paassover (also called "Pesach Sheni") is observed on the 14th day of the Hebrew Calendar month of Iyar. Pesach Sheni was created for those who (for some reason) didn't have the opportunity to observe the first Passover.
More information: Kiddush means "sanctification" in the English language.
More information: In the olden days, only a free person had the privilege to recline during meals. The servants and slaves, on the other hand, would often stand. Owing to this, the reclining position Jews assume at the Seder table is in celebration of the fact that they are free and no longer slaves.