Diwali or Dipawali
Diwali, or Dipawali, is India's biggest and most important holiday of the year. The festival gets its name from the row (avali) of clay lamps (deepa) that Indians light outside their homes to symbolize the inner light that protects from spiritual darkness. This festival is as important to Hindus as the Christmas holiday is to Christians.
Diwali occurs every year in autumn during the month of Kartik - which to us Westerners corresponds to mid-October to mid-November.