Chathapuram Sri Prasanna Maha Ganapathy temple is located at Kalpathy in Palakkad district, Kerala. The shrine is dedicated to Ganesha and the unique aspect of the murti is that its eyes are not opened. The murti is in standing posture. As the eyes are not opened the Ganapati is also known as Gnana Moorthy or Gnana Shantha Sowmya Prasanna Maha Ganapathy. The murti was placed in the granary Sri Krishna Pattar who had commissioned the making of the Ganpati murti.
Once during the annual ratholsavam or car festival of Kalpathy Viswanatha Swamy, the chariot did not move when it reached the granary having the murti of Chathapuram Sri Prasanna Maha Ganapathy. Elephants and large number of people were unable to pull the chariot. Suddenly an elder villager went into trance and asked Chathapuram Sri Prasanna Maha Ganapathy to be present before the chariot.
At the same time the rice and grains stored in the granary began to pour out. When the granary was opened it was found that the murti of Ganapati was being performed abhishekam with the grains and rice.
The elder person of the family immediately decked up the murti and took it meet Kalpathy Viswanatha Swamy. It marked the beginning of the famous koodikazhcha ritual – meeting of father and son. Kalpathy Viswanatha Swamy is Shiva and Chathapuram Sri Prasanna Maha Ganapathy is his son Ganesha. The ritual is held every year during the famous Kalpathy Ratholsavam held in mid November.
The annual prathishta dinam is held on Karthika nakshatra day in Edavam month. Laksharchana is also held in in Edavam (May - June).
Pongal ritual is held in the temple on Makar Sankranti day.
Vishu Kani darshanam of April 14 or April 15 (Medam 1) is of great importance in the temple.