Swarm the house?

My parents haven’t even packed more than six boxes and they’re already talking about something called a House Swarming. Holy crap, my fellow inebriates, I have no idea what to make of this. What does it mean? What the hell is a House Swarming?

Will the house be swarmed with people depositing things (liquor?) or removing things (liquor?)…

Or does it have anything to do with liquor at all?