Purim

In leap years on the Hebrew calendar, Purim is observed in the Second Adar (Adar Sheni).
Purim commemorates the events that took place in the Book of Esther. It is celebrated by reading or acting out the story of Esther, and by making disparaging noises at every mention of Haman's name.
In Purim it is a tradition to masquerade around in costumes and to give Mishloakh Manot (care packages, i.e. gifts of food and drink) to the poor and the needy. In Israel it is also a tradition to arrange festive parades, known as Ad-D'lo-Yada, in the town's main street. Sometimes the children dress up and act out the story of Esther for their parents.