Purim is celebrated with drinking, dressing up, and satirical performances, all recalling the evil decrees of Haman that were ultimately overturned.
Purim, or the Feast of Lots, is a joyous holiday that recounts the saving of the Jews from a threatened massacre during the Persian period (539-330 BCE). The story of Purim is recounted in the Book of Esther , whose eponymous heroine plays the leading role in saving her people. The holiday is traditionally celebrated with wild abandon and with the giving of gifts to friends and the poor.
While the origins of Purim appear clear from the Book of Esther , historians have looked in vain for any sort of extra-biblical corroboration of the events of the story. Be that as it may, it is a tale that purports to take place during a time when many Jews were living in Persia. A young Jewish woman, Esther, rises to be Queen of Persia under the tutelage of her guardian Mordecai. All, however, is not right. The Jews have enemies, and a certain Haman, the grand vizier, plots the Jews’ destruction. Even though Esther has hidden her Jewish identity from all, Mordecai prevails on her to risk her life by revealing her true identity to the king. She does this and denounces the evil Haman’s plot. At the end of the story, the Jews are able to turn the tables on their enemies, who are then punished in place of the intended victims. This story is one of the most beloved in the Jewish community, because of the hope that it gives a minority living in an oftentimes hostile majority culture.
In Masekhet Megillah (scroll), the Talmudic tractate devoted to Purim observances, Rabbi Akiva declares the Book of Esther to be divinely inspired. Some commentators believe this eventually led to the inclusion of Esther in the Hebrew Bible, despite the omission of God from the book. The Greek versions of Esther contain a number of additions–including God’s name–not found in the Hebrew story.
Material excerpted from http://www.myjewishlearning.com/