Question: When did the heavyweight boxing championship match, for which the Zaire 74 concert was intended to be a major promotional event, actually take place?  
Sentence (from "The Rumble in the Jungle"): The Rumble in the Jungle was a historic boxing event in Kinshasa, Zaire (now Democratic Republic of the Congo) on October 30, 1974 (at 4:00 am).
Relevant evidence: Yes