Baal-hazor is the setting of the climax of the tragic events that followed Amnon's assault on Tamar. According to 2 Samuel 13:23, two years after the assault Absalom held sheep-shearing festivities at Baal-hazor and invited all the king's sons.
David declined Absalom's invitation to attend but allowed Amnon and the other royal sons to go. At Absalom's command, his servants killed Amnon during the feast. Absalom then fled to Geshur, where he remained for three years.
Baal-hazor therefore marks an important stage in the deterioration of David's household that ultimately contributed to Absalom's estrangement, return, and later rebellion.