How will you celebrate? There are several organizations that promote literacy you might want to check out. Like:
Reading is Fundamental - they try to get books into the hands of children's who otherwise wouldn't have them.
International Reading Association - the world's leading organization of literacy professionals.
Reach Out & Read - where stories begin.
First Book - Access to New Books for Children in Need.
The Literacy Site - Give a book to a child every day!
Reading is Fundamental
I already link to many of these in my sidebar - here they are again:
Click here for more literacy-based charities: 10 Charities That Promote Literacy.