Diwali is the most important festival of the year in India — and for Hindus in particular. It is celebrated across faiths by more than a billion people in the world’s most populous nation and the diaspora. Over five days, people take part in festive gatherings, fireworks displays, feasts and prayer. [time-brightcove not-tgx=”true”] Diwali is derived from the word “Deepavali,” which means “a row of lights.” Celebrants light rows of traditional clay oil lamps outside their homes to symbolize the victory of light over darkness and knowledge over ignorance. When is Diwali? The dates of the festival are based on the Hindu lunar calendar, typically falling in late October or early November. This year, the holiday is being celebrated on Oct.