In what event, featuring the Dolphins and the Redskins, did John Riggins participate in?
John Riggins:  Although he had only one Pro Bowl appearance in his career, Riggins had his greatest success in the postseason, and was named the Most Valuable Player of Super Bowl XVII. Super Bowl XVII: Super Bowl XVII was an American football game between the American Football Conference (AFC) champion Miami Dolphins and the National Football Conference (NFC) champion Washington Redskins to decide the National Football League (NFL) champion for the 1982 season.
Super Bowl XVII