Chitragupta Puja is observed on Chaitra Purnima, the Full Moon day in Chaitra month. It is one of the big festivals for Kayasta sect of people. In 2013, Chaitra Purnima Chitragupta Puja date is April 25.
Chitragupt is believed to be the accountant or record keeper of Lord Yamas register Agra-Sandhaani. On Chaitra Purnima day, Chaitragupta is worshipped with shodashopachar puja.
Chaitra Poornima Chaitragupta pooja is celebrated in a grand manner in Tamil Nadu. At Kanchipuam, and some temples in Chennai, the image of Chaitragupta is taken out in a procession. On this day devotees take holy dip in the river Chitra. Literally, Chitragupta means the hidden picture but he records our every pap and punya (sin and good deed). Chitragupta Puja is also celebrated during Diwali as Chitragupta Jayanti (Dawat Puja) on Bhai Dhooj.