Here is an excerpt from their site:
Why should you register? YALSA is a non profit organization that depends on its members for support. By registering, you are letting us know that teen literacy is a concern and you are willing to do something about it! By registering, you are telling YALSA that this program is worthwhile, and we will continue to sponsor the week.Be sure to download the Teen Read Week LOL logo to include on your promotional materials and check out the official Teen Read Week products brought to you by YALSA and ALA Graphics. Also- visit the Plan Your Event section of the YALSA site and the Teen Read Week Wiki.
GOOD LUCK getting ready for October!