Diwali is a major festival celebrated by Hindus, Jains, Sikhs and some Buddhists, notably Newar Buddhists. The festival usually lasts five days and is celebrated during the Hindu lunisolar month Kartika.
Known as the "Festival of Lights,” it is a major holiday that signifies the renewal of life, and the victory of good over evil. Celebration activities include the lighting lamps and candles, fireworks, and the donning of new clothes.
You can learn more at https://www.diwalifestival.org/