I began by showing my first, second, and third grade classes an invitation to the celebration and explained what it was. The kids happily RSVPed "yes."
I read the first book, Ivy + Bean, to them. As we read, we discussed Ivy's and Bean's character traits and how the girls' feelings about each other changed over the course of the story.
The kids also used details from the story to come up with ideas for how they wanted to celebrate. They made some really creative connections to the book!