Note 1 at Acts 28:20: There were at least two purposes for Paul calling these Jewish leaders together. First, it had been the Jews in Judaea who had instigated all the turmoil that got Paul arrested. Again, the Jews were instrumental in keeping him bound when the Romans were determined to let him go (Acts 24:27; 25:9). Certainly, he was wanting to present his case to these Jewish leaders to try and prevent a repeat of that.

Secondly, Paul had purposed in his spirit to minister to those in Rome even before the riot and his imprisonment in Jerusalem (Acts 19:21). Therefore, he was simply taking advantage of the situation to share the gospel with the leaders of the Jewish community. He was successful in obtaining a day where they came together to hear him share the gospel.