Read 2 Samuel 16:22 Using Other Translations
So they spread Absalom a tent upon the top of the house; and Absalom went in unto his father's concubines in the sight of all Israel.
So they pitched a tent for Absalom on the roof. And Absalom went in to his father's concubines in the sight of all Israel.
So they set up a tent on the palace roof where everyone could see it, and Absalom went in and had sex with his father’s concubines.