Hindu devotees light earthen lamps on a Rangoli, a framework of decorated pattern in a field, as part of Diwali festivities in Narayanganj, Bangladesh. Many light oil lamps or candles to symbolize a victory of light over darkness, and fireworks are set off as part of the celebrations. This festival takes place every year in accordance with the Hindu lunar calendar. The word "Diwali" itself is derived from the Sanskrit word "deepavali, " meaning "series of lighted lamps," hence, it is also known as the festival of lights. Diwali is typically celebrated by socializing and exchanging gifts with family and friends. Bangladesh.