There are plenty of resources available from the Children's Book Week Digital Toolkit. I like to order the actual posters, but sadly, I forgot this year. The good news is that there are plenty of last-minute event kits and activity sheets available for download [http://www.bookweekonline.com/activities].
Also, be sure to download this year's official CBW bookmark with art by Cece Bell. [http://www.bookweekonline.com/bookmark]
You can also add a Twibbon to your Twitter profile pic. (If you don't want it to completely obscure your profile pic, you will have an opportunity to shrink it.) [http://twibbon.com/Support/Children39s-Book-Week]