Post Upakarma
The upakarma is done every year by ordinary grihastaas. As Brahmin at least once in a year, he should either recite the Veda or just do shravan or hear, duly after doing Deva Tharpanam, Rishi Tharpanam and Pitru Tharpanam. As in these days you cannot do it daily, the aged and wise have ordained us to do Upakarma by formally accepting to do that way. Subsequently, there is a ritual followed called "Utsarjan" with which we give up reciting Vedas till next Shravan. Readers well versed and competent can elucidate the significance of the procedures more in detail. All the best.