Psalm 24:7 tells the gates to lift up their heads so that who may enter?

Answer: The King of Glory

Psalm 24 asks, "Who is this King of Glory?" and answers, "The LORD of Hosts—He is the King of Glory."

“Lift up your heads, O gates! Be lifted up, O ancient doors, that the King of Glory may enter!”— Psalm 24:7 (BSB)