A compendium of resources to celebrate children and bilingual literacy on April 30th and every day:
Web site and resources for El día de los niños / El día de los libros - hosted by ALSC and ALA; very thorough; register your event
Founder and advocate Pat Mora's site - great resources, helpful background info on Día; email her...she might send your library a personal message!
Celebration information - Colorín Colorado - more great resources, ideas, activities
Día activities and resources - Presented by REFORMA
Join ALSC and REFORMA in celebrating Día 2009 - press release by ALA
I apologize in advance if any of these link addresses change before I have a chance to correct them.