The nation's leadership gathered for a major event centered around a historical structure from the desert journey. The great copper altar, originally crafted by Bezalel the son of Uri, was brought into the land of Israel and positioned by King Solomon in front of the Tabernacle of God. All the leaders and heads of the nation assembled together for this occasion.
The primary approach among commentators is that the congregation did not come to physically search for the altar. Rather, their gathering was a deliberate turn toward it for the purpose of worship. Solomon and the entire assembly focused entirely on this historical altar, coming together around it to offer their sacrifices.