I Am Invited to a Party!: 10/24/11
I Am Invited to a Party! by Mo Willems would make a nice companion book to Big Red Lollipop by Rukhsana Khan. Piggie has been invited to a party and asks Gerald to help her prepare. Fortunately Gerald knows parties!
Gerald goes through all the different possibilities for the party. It might be formal. It night be a costume party. It might be a swim party. Gerald and Piggie (though less enthusiastically) decide its best to prepared for every eventuality.
It's cute for its absurdity and even better for how it ends. I would add it as a companion to Khan's books to show how trends are changing and siblings or friends are more and more being invited to parties, especially those held for children. It's no longer usually just the one on the invitation who is invited.