وَصَلَ الرَّسُولُ، وَاجْتَمَعَ أَهْلُ الْبَلَدِ لِسَمَاعِ الْخَبَرِ.
The messenger arrived, and the townspeople gathered to hear the news.
The arrival and the gathering are independent predications linked by a common scene: reception of the report. That intelligible jāmiʿ supports coordination with wāw.
The second does not merely restate or replace the first; it adds another event. If wāw would put a clause under an unintended quotation or command, another reason for separation could override the apparent connection.