Durga puja (also referred to as Durgotsava) is an annual Hindu festival in South Asia that celebrates worship of the Hindu goddess Durga. It refers to all the six days observed as Mahalaya, Shashthi, Maha Saptami, Maha Ashtami, Maha Navami and Vijayadashami. The dates of Durga Puja celebrations are set according to the traditional Hindu calendar and the fortnight corresponding to the festival is called Devi Paksha (Fortnight of the Goddess). Devi Paksha is preceded by Mahalaya (Bengali: মহালয়া), the last day of the previous fortnight Pitri Paksha (Fortnight of the Forefathers), and is ended on Kojagori Lokkhi Puja (Worship of Goddess Lakshmi on Kojagori Full Moon Night).
Durga Puja is widely celebrated in the Indian states of Assam, Bihar, Jharkhand, Orissa, Tripura and West Bengal, where it is a five-day annual holiday. In West Bengal and Tripura, which has majority of Bengali Hindus it is the biggest festival of the year. Not only is it the biggest Hindu festival celebrated throughout the State, but it is also the most significant socio-cultural event in Bengali society. Apart from eastern India, Durga Puja is also celebrated in Delhi, Uttar Pradesh, Maharashtra, Gujarat, Punjab, Kashmir, Karnataka and Kerala. Durga Puja is also celebrated as a major festival in Nepal and in Bangladesh where 10% population are Hindu. Nowadays, many diaspora Bengali cultural organizations arrange for Durgotsab in countries such as the United States, Canada, United Kingdom, Australia, Germany, France, The Netherlands, Singapore and Kuwait, among others. In 2006, a grand Durga Puja ceremony was held in the Great Court of the British Museum.