The thing I would do if it was me would be to make it fold like a horizontal hangar door. It would require rebuilding the door.
I would start with the hardware kit to hang lightweight bifold closet doors, and some pulleys and parachute cord. I believe it could be engineered in a way that you could pull a single rope down, tie it around a cleat and when the festivities have ended for the evening, unwrap the cord from the cleat and gravity would close it. A simple latching mechanism would keep it windproof.
