It starts 15 days after Kharchi Puja.

The area in and around the royal palace here as well as Puran Habeli, the erstwhile capital of Tripura, around 12 km east of this city, have been notified for Ker Puja. 

Ker Puja starts on Monday night and will continue uninterrupted for over 30 hours, permits no deaths, births or even recreation within a notified area recreation within a notified area. No outsiders are allowed to enter either, and anyone violating the rules has to pay.

A structure constructed with green bamboo poles serves as the deity for Ker Puja. The 'chantais', or head priest, is regarded as the king on the occasion. 

At the end of the 517-year rule by 184 kings, Oct 15, 1949, the erstwhile princely state of Tripura came under the control of the Government of India, according to a merger agreement signed with Kanchan Prabha Devi, then regent maharani. The agreement made it obligatory for the Tripura government to continue the sponsorship of temples, pujas and festivals earlier organized by the royals. And it continues to this day.