Many years ago, a friend of mine in India said to me “Come and visit us during Diwali.”
Diwali is a festival of lights and one of the major festivals celebrated by Hindus, Jains, Sikhs and some Buddhists.
The festival usually lasts five days and is celebrated during the Hindu lunisolar month Kartika (between mid-October and mid-November).
One of the most popular festivals of Hinduism, Diwali symbolizes the spiritual "victory of light over darkness, good over evil, and knowledge over ignorance”. - Wikipedia