The Nisan Feast is a Jewish holiday that is celebrated on the 15th day of the month of Nisan. It is also known as the Passover Seder, which is a ritual meal that marks the beginning of the Jewish holiday of Passover. The Seder is a time for families to come together and celebrate the Exodus from Egypt. During the Seder, a special meal is eaten and prayers are said. The Seder is a time for families to remember their history and to celebrate the freedom they have been given.