Click here to read that article.
I would also recommend an article written the following day by Caitlin Fitzsimmons in the same publication putting in a case for book week parades. She highlights that it has become an annual tradition in our schools but also promotes literature. In addition, she rebuts arguments about some of the "hassles" in organising costumes and highlights that not much effort is needed for a good costume
I will update you when the article appears on their blog, but note that it will not be available publically as it will be for SLANSW members only.