This is the second letter my son has written—of his own volition—to Mo Willems. The book that inspired him to write this time was That Is Not a Good Idea!
We found an address to send it to here. Last time he got a reply.
P.S. I have redacted Red Chief's name from the letter, which is why it appears to say "from first grade" at the bottom.
P.P.S. Translations: since=science; specing=speaking; whosps=wasps; serys=series