The phrase “Polka Hall of Fame” conjures up visions of a converted armory filled with bronzed accordions, embalmed kielbasas, and a diorama depicting a Slovenian wedding party. Delicious, I think you’ll agree. But if your lover of the underdog doesn’t live within a day’s drive of the Welk Belt (the buckle, it appears, is Cleveland) than the next best thing would be a membership.