This month is dedicated to worship of deities. It starts on December 17 and end on January 13. Our one earth year is considered as one day for Devas. So for the Deva loka this month is considered as morning time and Brahmamuhurtha for Devas.
Generally morning time is apt for worship and meditation. For this reason there are no festivals and functions in this month only worships for deities. This whole month is dedicated for worships. Carnatic music concerts are held in this month.
The worship called Raapatthu and Pagalpatthu is
celebrated in Sri Rangam Temple for 21 days. Thiruvempavai is also
recited in all temples in the mornings. The most important worships in this
month are Paavai Nombu, Vaikunda Ekadesi, Hanuman Jayanthi and Arudara
Dharshan. The pilgrim season in Sabarimala will end in this month which
started on Karthigai month.