In his book vaitheeka sri ; brahmasri nannilam Rajagopala ganapadikal says as dosham is also there on 6-9-2017 it is better to do avani avittam for ruk and yajur on 7-8-2017 and Gayathri japam on 8-8-2017.only for first year avani avittam persons will do some shanthi and then do upakarma.