Anyone hear that? That was the sound of a proverbial gate being crashed.

"Hope you're all enjoying Peevesy's little gifts." And that was the sound of an unproblematic little poltergeist, emerging from a nearby shrub and wearing his most devious innocent expression. Still he had his precious book with him. "I've been enjoying myself very much."

Oh, and... congratulations to... the greenhouses. Or whatever the point of this party was. Peeves had his own reasons for being here: the entertainment, and extending the entertainment even further! Floating above the swarm of students, Peeves paused only to send a VERY obvious spell towards one of those he'd not had the chance to get yet (Hooper), and cackled as only Peeves knew how to cackle.