The nights of the Nine days of Bada Dashain are called Navaraat (Navaratri-the first nine days of Dashain). Navaraat is the night from Ghatasthapana to Nawami. Since it is celebrated for Nine days, it is definitely not called Navaraat. Navaraat means new night. On this day, Navin Raat has been celebrated because of the creation of Navadurga Ashta Matrika Gana in Bhaktapur. From Ghatasthapana to Ashtami, Brahmayani, Maheshwari, Kaumari (Kumari), Bhadrakali, Barahi, Indrayani, Mahakali and Mahalakshmi are created respectively, so fairs are held at these places on these Eight nights.
Navaraat is also called Nauraat in local native language(Nepalbhasa), nine is the word for star. Those evenings are named Nauraat because it is a pilgrimage that should be done when there are stars. That is, early in the morning before the rays of the sun come up and after dark in the evening, people go to the temple of these goddesses to pray. But on the day of Nawami, instead of Ashta Matrika, one of the Dasamahabidya, Goddess Tripura Sundari , is worshipped.
Tripura Sundari is a form of Goddess Parbati. Mahishasura was slain by Goddess Tripura Sundari on Nawami. Mahishasura entered Khamye i.e. Rango (Male Buffalo) ran away from the Goddess. Goddess found out about it and killed Mahishasura in Bramhayani. Thus, on the day of Nawami, Goddess Tripura Sundari was worshiped because of the killing of the asura king Mahishasura, and the day after that, victory was celebrated on the day of Vijaya Dashami. As a remembrance of this, on the day of Dashami, he accepts Tika from the hand of his elder.
