"Mmm..." Hermione glances around the party, looking for something that she can clear up as an example. She spots a plate, presumably once holding a piece of plate, left neatly on a nearby table. Looking around to see if anyone's watching closely, Hermione flicks her wand in its direction, Summoning it over and catching it with her free hand.

"I'm not nearly as good as my mother-in-law is, but I'll have many years to practice, I'm sure," Hermione says with a smile. With another wave of the wand, she Banishes the remaining smears of icing and crumbs, leaving the plate as spotless as it was before the reception.