DECA has been in Massachusetts high schools since 1957. Students attend leadership conferences in the fall and competitive conferences from December-March. Massachusetts DECA is the largest business association for high school students in New England and the Massachusetts DECA State Career Development Conference is the largest student conference held in Boston. with close to 4,000 attendees. Massachusetts DECA depends on the volunteerism of approximately 700 adults from industry to serve as judges at the district and state conferences each year.