A logo is an easily recognizable symbol of an organization and should always be treated with respect. The AMA logo conveys that your event is sanctioned with the AMA, whose mission is to promote the motorcycle lifestyle and protect the future of motorcycling. It shows that your event insured and follows a set of rules.
All AMA organizers are required to use the current AMA logos on promotional materials and websites. Old logos should never be used.
The AMA has provided examples of how to properly use the logos and logo files for downloading at http://www.americanmotorcyclist.com/Riding/Story/supply-requests-and-logos.
Each .zip file contains an .eps (For use with Adobe Illustrator. Many graphics/printing shops use this file type) and a .jpg of the logos.