Luna Lovegood and Ginny Weasley with Ginny's pet Pygmy Puff, Arnold.
Sisters Becky, 15, and Katie, 13, Gehrmann heard about The Party That Must Not Be Named on The Leaky Cauldron's PotterCast. They drove in from Madison, Wis., with their parents Thursday night.
Also spotted in front of Ollivander's/Canterbury Shoppe: Nymphadora Tonks and friends.
Dressed as Tonks in a pink wig and "I heart Lupin" T shirt, Sara Fink of Grand Rapids, Mich., posed with friends 26-year-old Karen Statler of Grand Rapids, 29-year-old Lindsay Lefevere of Indianapolis and 22-year-old Loran Sandmann of Indianapolis.
Fink, 30, drove to Naperville with her friends, her husband Mark (wearing a "Muggle" T shirt) and one-year-old son Duclan in a car with the license plate "MUGGLES" after reading about The Party That Must Not Be Named in The New York Times.
"I'm trying not to think about it," she said of the final book's ending. "I'm not ready for it. I just hope nothing bad happens to the Weasleys."