Many festivals are celebrated at Arunachaleswarar temple in Tiruvannamalai throughout the year. Among them Karthigai Deepam is the most significant festival that is celebrated with pomp and gaiety at Arunachaleswarar temple.In this year Karthikai Deepam falls on 12th December,2016 .This Karthigai Deepam is celebrated as a ten day festival and it widely known as Karthigai Brahmotsavam.