The temple is also an important pilgrim center, especially for the eleven-day-long annual festival celebrated in March and April months of the Gregorian calendar. The "principal deity" of temple is Lord Shiva. But the famous deity is Sree Bhadrakali or Sree Parvathy, locally known as "Thirumandhamkunnilamma" and Ganesha, for whom the famous marriage oblation ("Mangalya Puja") is performed. Devotees believe Mangalya puja will remove obstacles for one's marriage. Thirumandhamkunnilamma is considered the Supreme Mother, "Shakthi Devi" in Hinduism. Bhadrakali believed to be born from the third eye of lord Shiva to kill the demon king Daruka. Bhadra means good and Kali means goddess of time. Bhadrakali is worshiped for prosperity and salvation. Devi is considered as the creator, protector, destroyer, nature & kundalini. Mangalya Puja, Rigveda Laksharchana, Chandattam and Kalampattu are the important religious offerings of the Thirumanthamkunnu Temple.