See Luke, chapter one, verse 59.;’ and it befell on the eighth day they came for the circumcision of the child, and were for calling him by his father’s name, Zachary’, (speaking of the birth of John the Baptist).
And Luke, chapter two, verse 21: ‘and when eight days had been completed for the day of his circumcision, his name was called Jesus’.
Followed by verse 22. ‘And when the days of purification had been completed according to the Law of Moses, they brought him up to Jerusalem to present him to the Lord’. Clearly a separate event. and related to the ritual uncleanness of the mother because of the blood loss that continues after childbirth.