kali puja is also known as shyama puja or mahanisha puja. it is a festival celebrated in the honour of hindu goddess kali. it is celebrated on the new moon day of the hindu month kartik. it is mostly celebrated in west bengal, bihar, odisha, assam, tripura and bangladesh. it happens at the same time with the pan-indian lakshmi puja day of diwali. in this day bengalis, odias, assamese and maithils worship goddess kali and the rest of india worships goddess lakshmi on diwali. mahanisha puja is done by the maithili people of mithila region in india and nepal.