Upakarma means the beginning or arambha of something auspicious. Generally it is associated with the beginning of the learning of the Veda. But apart from that it is also associated with the changing of the Yajna pavit of the Brahmans or the changing of the sacred thread along with the Shrouta recitals. The Yajur Veda Avani Avittam as it is called or the Yajur Veda Upakarma is practiced by the YajurVedi Brahmins of Tamil Nadu, Kerala, Andhra Pradesh and Karnataka. The Yajnapavita Dharanam is the major observance of that day. From this auspicious day the Yajurvedi Brahmins also start reading the Yajur Veda for the coming 6 months. It is considered to be extremely auspicious as it is believed that on this day Lord Hayagriva, who is considered to be the Lord of Knowledge restored the Vedas to the Gods from the demons.