Question: When was the historic boxing event that Zaire 74 was meant to promote?
Sentence (from "The Rumble in the Jungle"): Held at the 20th of May Stadium (now the Stade Tata Raphaël), it pitted the undefeated world heavyweight champion George Foreman against challenger Muhammad Ali, a former heavyweight champion; the attendance was 60,000.
Relevant evidence: No