Question: In what event, featuring the Dolphins and the Redskins, did John Riggins participate in?
Sentence (from "John Riggins"): Robert John Riggins (born August 4, 1949), nicknamed "The Diesel" and "Riggo", is a former American football running back who played professionally in the National Football League (NFL) for the New York Jets and Washington Redskins.
Relevant evidence: No