Published: Tuesday, September 30, 2014, 15:32 [IST] The festivals of Navratri and Durga Puja coincide with each other. Durga Puja starts on the sixth day of Navratri. And this day is called Durga Shashti or Mahashashti. This is technically the day when Goddess Durga arrives in the mortal world after completing her journey from Kailash. Shashti puja has some very interesting rituals. Many women perform a special puja on the day of Durga Shashti.