Early morning feel it.Did you not? Saying goes:'One must not pay a visit without engagement'. What say you of the statement?
Without invitation or appointment such protocol may sound unwise but if making approach with good intention of interactive approach and further strengthen between their relationship suppose can consider the move is positive protocol. Eventhough may encounter some other problem in welcoming protocol from the hosting side it is okay for visiting guest has done the initiative in best! Non is perfect in this World.