What were the most prominent meetings and discussions that took place between Sa'id ibn al-Musayyib and Caliph Abd al-Malik ibn Marwan, which included admonition and advice?

Saeed ibn Al-Musayyib was not a Companion (Sahabi); rather, he was a Tabi'i (successor to the Companions), born two years after Umar's caliphate. He acquired his knowledge from the Companions. He was the master of the Tabi'in and a great jurist who spoke the truth boldly, and he refused to meet with the Umayyads. Information about him can be found in "Siyar A'lam Al-Nubala'."