Albert Barnes Commentary 1 Kings 9:2

"that Jehovah appeared to Solomon the second time, as he had appeared unto him at Gibeon." — 1 Kings 9:2 (ASV)

This appearance is fixed by 1 Kings 9:1 to Solomon’s twenty-fourth year, which was the year he completed his palace (1 Kings 6:37–38; 1 Kings 7:1). It seems that although the temple was finished in Solomon’s eleventh year, the dedication did not take place until his twenty-fourth year.

The order of the narrative in Kings agrees with this view, as it places the account of the palace's construction (1 Kings 7:1–12) and the making of the furniture (1 Kings 7:13–51) between the completion of the temple building (1 Kings 6:38) and the dedication ceremony (1 Kings 8).