For the fifth time ever, best friends Elephant and Piggie have five BIGGIE adventures in one book! From award-winning, best-selling author and illustrator Mo Willems, this BIGGIE bind-up of Elephant and Piggie adventures will make readers want to celebrate! This bind-up includes the titles: I Am Invited to a Party!; I Will Surprise My Friend!; Happy Pig Day!; Waiting Is Not Easy!; and The Thank You Book.