We are also commanded to eat, drink and be merry. According to the Talmud, a person is required to drink until he cannot tell the difference between "cursed be Haman" and "blessed be Mordecai," though opinions differ as to exactly how drunk that is.
It is customary to hold carnival-like celebrations on Purim, to perform plays and parodies, and to hold beauty contests. I have heard that the usual prohibitions against cross-dressing are lifted during this holiday, but I am not certain about that. Americans sometimes refer to Purim as the Jewish Mardi Gras.
Aw yeah. And it's good prep for St. Patty's. See, Irish Catholics, you have lots in common with other religions. Note to Protestants: Seriously, you left the best parts behind, didn't you? No wonder this country is going to hell; all the cool people stayed on the other side of the ocean.
Happy Purim 5766!