Durga Ashtami
The eighth day of Navratri or Durga Puja celebrations is known as Durgashtami, or Durga Ashtami. It is also known as Mahashtami and is one of the most auspicious day according to Hinduism. It falls on bright lunar fortnight Ashtami tithi of Aswina month according to the Hindu calendar.
It is believed in some regions, the Goddess Chamunda appeared on this day from the forehead of Mother Durga and annihilated Chanda, Munda, and Rakthabija (the demons who were associates of Mahishasura).