Upakarma means beginning, referring to the ritualistic beginning of learning Veda. Apart from learning Vedas on Upakarma day, Dvija ritually changes their Upanayana thread along with Shrauta rituals. Upakarma which is a Vedic ritual is still practiced by Hindus.
To Participate in the UPAKARMA
Those who follow Yajurveda observe the Upakarma on the full moon day during Shravan month i.e. on Shravana Purnima day. Those who follow Rigveda observe the Upakarma on Shravana Nakshatra day in the month of Shravana. Hence the day to observe Upakarma might differ for the followers of Yajurveda and Rigveda.
The main purpose of the Upakarma ritual is to offer prayers and express the gratitude to those Rishis who gave the knowledge of Vedas and revealed Vedic Mantras to the mankind.
Sapta Rishi Avahana
Change of Yajnopaveetam (Temple will provide Yagnopaveetam)