One of the important pujas performed at Trimbakeshwar i.e. Narayan Nagbali Puja.
Narayan Nagbali Puja is a combination of two different pujas. Which includes Narayana Bali puja and Nagbali Puja. Both these pujas are combined as Narayana Nagabali Puja.
It is performed for the salvation of our ancestors.
Article source: https://www.purohitsangh.org/narayan-nagbali