Rig-Veda Upakarma is a Vedic ritual still practiced by Brahmins, by which they change their Upanayana thread accompanied by Shrauta rituals.
In Tamil Nadu, the Upakarma is known as Avani Avittam and the next day of Avani Avittam is known as Gayatri Japam.
I am very much obliged if you could kindly let me know either the uthsarjans homam is done on the upakarma day or when finishing the attiyayanam in January. Some one it is to be done on the upakarma day. And someone says it should be done on the attyayana finishing day. I shall be very much thankful if you could find an answer for me.
Thanking you.
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