Like Devi Durga, Devi Kaali is also worshipped on various occasions. The most common occasion is the Kartika Amavasya that falls in the month of October-November. It generally coincides with the main night of Diwali i.e. the Laxmi Puja night. In many regions, it is celebrated one day prior on Kali Chaudas.
Quite a few believers also pray to Devi Kali during the Navratris that precede Diwali. People who are suffering from the malefic effects of Shani i.e. Saturn should definitely pray to Devi Kali on Kali Chaudas – that is a day after Dhantrayodashi. One can perform the Dus Maha Vidya MahaKali Puja to free themselves from the clutches of negativity.