Navratri is a nine-day festival when devotees offer their prayers and worship to the nine avatars of goddess Durga. Whil theoretically there are four types of Navratris, it is the one leading up to Dussehra and then Diwali that the people in India celebrate the most with aplomb and fun. From beautiful and resplendent Pujo pandals and delicious delicacies in Kolkata to people observing nine days of devout fasting and meditation in other parts of the country — devotees all come together to celebrae essentially one thing — the victory of good over evil when Durga emerged victorious over the demon king Mahishasura. .
Navratri is celebrated in most Indian regions but the tradition differs from state to state. However, the festivities are are more popular and prominently celebrated in the western states of Gujarat, Maharashtra, West Bengal and the southern state of Karnataka.
On the very first day of Navratri, goddess Durga is invoked into a Kalash with full Vedic rituals along with chanting of mantras. The invocation and dwelling of the goddess into the Kalash is known as Ghatasthapana or Kalashsthapana which happens at an auspicious time of the day.
In West Bengal, Durga Puja as it is known is celebrated with vigour on the last three days of Navratri. These three days are popularly known as Durga Saptami, Durga Ashtami, and Durga Navami. Kalparambha and Bilva Nimantran during Durga Puja, which is done on the sixth day of Navratri, is symbolically same as Ghatasthapana or Kalashsthapana in other states.
Jyoti Kalash, Kumari Puja, Sandhi Puja, Navami Homa, Lalitha Vrat and Chandi Path are other famous rituals and events which are observed during the nine days of Navratri.
According to Drikpanchang.com, the Ghatasthapana Muhurta will begin at 6:13 am and go on till 8:10 am. The Pratipada Tithi will begin on September 20 at 10:59 am and end next day at 10:34 am.