After the girls finish their project, they take it to the "coordinator," who gives them a pin for their apron. Some of the kids who have been going to the workshops for years have aprons completely covered in pins.
The first time you go to the workshop, your child gets an apron with their name written on it. Kind of silly, but the girls love anything that resembles a costume. Sabrina carrying off her finished calendar; Catherine getting her apron pin.