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?  

Context articles: Zaire 74
The Rumble in the Jungle
Joe Hipp
Frank Goddard
Money in the Bank ladder match
Woodward–Hoffmann rules
Aniversario: Never Compromise
Soul Power (film)
List of iconic photographs
Dominion 7.5 in Osaka-jo Hall

Zaire 74 was a three-day live music festival that took place on September 22 to 24, 1974 at the 20th of May Stadium in Kinshasa, Zaire (now Democratic Republic of the Congo).
 The concert, conceived by South African trumpeter Hugh Masekela and record producer Stewart Levine, was meant to be a major promotional event for the heavyweight boxing championship match between Muhammad Ali and George Foreman, known as The Rumble in the Jungle.
 When an injury forced Foreman to postpone the fight by six weeks, the festival's intended audience of international tourists was all but eliminated and Levine had to decide whether or not to cancel the event.
 The decision was made to move forward, and 80,000 people attended.
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).
 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.
 Ali won by knockout, putting Foreman down just before the end of the eighth round.
 It has been called "arguably the greatest sporting event of the 20th century".
 The event was one of Don King's first ventures as a professional boxing promoter.
Joe "The Boss" Hipp (born December 7, 1962) is a retired professional Native American heavyweight boxer.
 A member of the Blackfeet Tribe, he became the first Native American to challenge for a world heavyweight boxing championship on August 19, 1995 when he fought WBA champion Bruce Seldon at the MGM Grand Garden Arena.
 In May 2009, he was inducted into the American Indian Athletic Hall of Fame.
Percy Frank Goddard (27 November 1891- 8 December 1957) was a British boxer who became the heavyweight boxing champion in 1923.
 Goddard's career begin in 1914 and it soon became apparent that he was one of the best boxers in the UK.
 He became the British heavyweight boxing champion on 26 May 1919 having beaten Jack Curphey for the vacant British Boxing Board of Control (BBBofC) British heavyweight title.
 Goddard lost the British heavyweight championship on 17 June 1919 to Joe Beckett.
The Money in the Bank ladder match is a multi-person ladder match held by the professional wrestling promotion WWE.
 First contested at WWE's annual WrestleMania event beginning in 2005, a separate Money in the Bank pay-per-view was established in 2010.
 The prize in the match is a briefcase containing a contract for a championship match, which can be "cashed in" by the holder of the briefcase at any point in the year following their victory.
 If the contract is not used within the year of winning it, it will be invalid, but this has yet to happen.
 From its inception until 2017, only ladder matches featuring male wrestlers occurred, with the contract being for a world championship match.
 Beginning with the 2017 event, women also have the opportunity to compete in the match, with their prize being for a women's championship match.
The Woodward–Hoffmann rules, devised by Robert Burns Woodward and Roald Hoffmann, are a set of rules in organic chemistry predicting the barrier heights of pericyclic reactions based upon conservation of orbital symmetry.
 The Woodward–Hoffmann rules can be applied to understand electrocyclic reactions, cycloadditions (including cheletropic reactions), sigmatropic reactions, and group transfer reactions. Reactions are classified as "forbidden" if there is an additional symmetry imposed energetic barrier arising from correlation of the ground state electronic configuration of the starting material with an excited state in the product.
 A reaction is classified as "allowed" if no such additional barrier exists.
 Thus, these terms do not imply whether a reaction in question will actually take place.
 Rather, with all other energetic factors being equal, an additional electronic factor exists to impede the symmetry forbidden reaction.
 Symmetry forbidden reactions can still take place via a pericyclic pathway if other factors (e.g. strain release) favor the reaction.
Aniversario: Never Compromise was a professional wrestling internet pay-per-view (iPPV) event produced by the Chikara promotion, that took place on June 2, 2013, at the Trocadero Theatre in Philadelphia, Pennsylvania.
 The event marked Chikara's fourth iPPV, third to take place at the Trocadero Theatre and the promotion's only event to take place in Philadelphia in 2013.
 Much like the previous iPPV, Under the Hood, Aniversario: Never Compromise also aired through Smart Mark Video.
 Aniversario: Never Compromise celebrated Chikara's eleventh anniversary and was the first anniversary event to take place on iPPV; in the past, the promotion had celebrated its anniversaries with weekends of two shows.
 The event saw all three Chikara championships being defended with one title change, where Pieces of Hate (Jigsaw and The Shard) defeated 3.0 (Scott Parker and Shane Matthews) for the Campeonatos de Parejas.
 Another major match during the event saw former Campeones de Parejas, Amasis and Ophidian, end their nineteen-month storyline rivalry in a Sarcophagus match.
 The event concluded with a major storyline development, where Chikara's authority figure Wink Vavasseur ended the event and shut down the promotion, while the main event was still going on in the ring, leading to the promotion going inactive for a full year.
Soul Power is a 2008 documentary film directed by Jeff Levy-Hinte about the Zaire 74 music festival in Kinshasa which accompanied the Rumble in the Jungle heavyweight boxing championship match between Muhammad Ali and George Foreman in October 1974.
Many books have been produced about iconic photographs and giving suggested examples.
 This list of iconic photographs provides an index to articles where the major topic is an iconic photograph of events or people.
 The requirement is that the particular photographs themselves are sufficiently famous to warrant an article – the fame of the person or event is not in itself enough.
 Sometimes the articles are about the person rather than the photograph taken of them but this is normally where they would probably not have become notable except for the image.
 Some of the photographs are of staged situations that did not actually take place at all.
Dominion 7.5 in Osaka-jo Hall was a professional wrestling pay-per-view (PPV) promoted by New Japan Pro-Wrestling (NJPW).
 The event took place on July 5, 2015, in Osaka, Osaka, at the Osaka-jō Hall.
 The event featured ten matches (including one dark match) with all six of NJPW's championships on the line, main evented by an IWGP Heavyweight Championship match between champion A.J. Styles and challenger Kazuchika Okada.
 In addition to airing worldwide through NJPW's internet streaming site, NJPW World, the event also aired in Japan as a regular PPV through SKY PerfecTV!
.
 The event marked NJPW's first show in Osaka-jō Hall in 21 years and drew 11,400 fans to the arena.
 This was the seventh event under the Dominion name and the first to take place in July.