I guess that's the Annual Competition and Festival at the Boston Marriott Quincy from July 11-15, 2004.
You can find our more about it at http://www.ameraccord.com/.

Another interesting source of information: http://www.accordionlinks.com

Is it politically incorrect stereotyping to relate accordionists and "Lady of Spain"? I once dated a woman who played the accordion (not well), and she said she'd never heard of "Lady of Spain." Now, at the Cotati Accordion Festival in California in August, the festival closes every year with everybody playing "Lady of Spain." Hey, the Cotati festival even has Valet Bicycle Parking (this IS California, you know), for those of you who like to ferry your accordions around by bicycle.

-Joe Offer-