It was 1984 — Prince’s “Purple Rain“ was the No. 1 album in America. Bruce Springsteen crisscrossed the country on his “Born in the U.S.A.“ tour. Madonna scored her first Top 10 single with “Borderline.” And on the south side of Milwaukee, Frankie Yankovic, “America’s Polka King,” performed at the Our Lady Queen of Peace Parish Festival. In attendance that day was 6-year-old Mike Schneider. His parents planned to drop him off at the festival rides while they enjoyed the polka show. That’s not wh