When Dunham was in the sixth grade, he began attending the Vent Haven ConVENTion in Fort Mitchell, Kentucky, an annual international meeting of ventriloquists that includes competitions, where he met Jimmy Nelson in person. Dunham has missed only one ConVENTion since then, in 1977. The organizers of the ConVENTion eventually declared Dunham a "retired champion", ineligible from entering any more competitions, as other attendees were too intimidated to compete against him. The Vent Haven Museum devotes a section to Dunham, alongside Señor Wences and Dunham's idol, Edgar Bergen.