Shyama Puja, also known as Kali Puja or Mahanisha, is the popular puja observed on Diwali in Bengal, Orissa, and Assam. In 2017, Shyama Puja date is October 19.
On the same day other states of India celebrate Lakshmi Puja.
On this festive day, devotees worship Goddess Shyama (Kali Mata) in ritualistic manner. Tantric puja vidhana is most popular to worship Goddess Kali on this day. Red Hibiscus flowers are offered to the deity. Devotees mediate and observe fasting during this auspicious day to get blessings from the Goddess.
Kali Puja Pandals are erected in many cities including Kolkata, Guwahati, Bhubaneswar, etc. to worship the Goddess in grand fashion. Pandals also place the idols of Lord Shiva and Dasa Mahavidya (ten Tantrik Goddesses headed by Kali Maa), and images of Ramakrishna. Kalibari temples across India host jubilant celebrations. In New Delhi, Mumbai, Lucknow, Hyderabad, Bangalore, Pune, and in many other cities Bengali communities organize Kali puja pandals.
In Kolkata Kalighat temple, Kali is worshipped as Goddess Lakshmi on Kali Puja day. Another famous Kali temple in Kolkata is Dakshineswar Kali Temple.