Rig Veda Upakarma
The Rig Veda Upakarma day is a day on which Brahmins ritually change their Upanayana thread along with Shrauta rituals. Upakarma which is a Vedic ritual is still practiced by Hindus of Brahmin caste. Upakarma is known as Avani Avittam in Tamil Nadu. The next day of Avani Avittam is known as Gayathiri Japam.