Elizabeth I used state visits as a weapon against nobles she suspected of intrigue. They had a hard time plotting while she, and her retinue were at their home, and so long as she stayed tradition and honor demanded that they lay out kingly, umm, queenly, feasts and entertainment. By the time she left they were too busy staving off creditors to indulge in plotting.
Well, feasting and economic depletion works too, and it’s sure a lot less bloody!