The 15th Adar is known as Shushan Purim since in the Persian capital of Shushan, the Jews were required to continue defending themselves against their enemies for one more day. It refers to the evil machinations of Haman who cast lots to determine on which day he should arrange for the slaughter of the Jews of Persia. Observance In the Synagogue . In the Home . Purim is the occasion for parties and celebrations and a festive meal or seu'dah which is held with family and friends.
People give charity and exchange gifts of food, as required by the Book of Esther.
Because of the turnabout of the fate of the Jews, there is also a custom of masquerading on Purim, including masked parades and carnivals in Israel.