Question: When was the historic boxing event that Zaire 74 was meant to promote?

Context articles: Shoot Boxing World Tournament 2010
Shoot Boxing World Tournament 1995
Snowy Baker
Boxing World Cup
The Rumble in the Jungle
ABA Stadium
Shoot Boxing – S-Cup 1996
Zaire 74
High Noon in Hong Kong
Soul Power (film)

Shoot Boxing World Tournament 2010 or S-Cup 2010 was a shoot boxing event promoted by Caesar Takeshi.
 It was the seven bi-annual (70kg/154lbs weight class) Shoot Boxing World Tournament, featuring an eight-man single elimination format, with one reserve fight, all fought under Shoot Boxing Rules.
 The eight finalists and two reserve fighters were a mixture of invitees or had been involved in previous events (for more detail on this see the bulleted list below).
 As well as tournament matches there were also two 'Opening Fights', a 'Women's Fight' and three 'Super Fights' all fought under Shoot Boxing Rules (various weight classes).
 In total there were twenty-two fighters at the event, representing six countries.
Shoot Boxing World Tournament 1995 or S-Cup 1995 was a shoot boxing event promoted by Caesar Takeshi.
 It was the inaugural (70kg/154lbs weight class) Shoot Boxing World Tournament, featuring an eight single elimination format, fought under Shoot Boxing Rules.
 In total there were eight fighters at the event, representing five countries.
 The tournament winner was Hiromu Yoshitaka who defeated Ron Belliveau in the final.
 The event was held at the Osaka Prefectural Gymnasium on Wednesday, 31 January 1995.
Reginald Leslie "Snowy" Baker (8 February 18842 December 1953) was an Australian athlete, sports promoter, and actor.
 Born in Surry Hills, an inner-city suburb of Sydney, New South Wales, Baker excelled at a number of sports, winning New South Wales swimming and boxing championships while still a teenager.
 Playing rugby union for Eastern Suburbs, he played several games for New South Wales against Queensland, and in 1904 represented Australia in two Test matches against Great Britain.
 At the 1908 London Olympics, Baker represented Australasia in swimming and diving, as well as taking part in the middleweight boxing event, in which he won a silver medal.
 He also excelled in horsemanship, water polo, running, rowing and cricket.
 However, "His stature as an athlete depends largely upon the enormous range rather than the outstanding excellence of his activities; it was as an entrepreneur-showman, publicist and businessman that he seems in retrospect to have been most important."
Boxing World Cup is an international boxing event which features boxers competing in different weight divisions, organized by the International Boxing Association.
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.
Auckland Boxing Association Stadium (also known as ABA Stadium) is a New Zealand venue for combat sports hosting over 150 events in boxing alone.
 ABA Stadium is also recognized for its grassroots of boxing.
 The earliest reported professional boxing event according to Boxrec was in June 1992 where Jimmy Thunder fought Craig Petersen for the Australian Title.
Shoot Boxing – S-Cup 1996 was a shoot boxing event promoted by Caesar Takeshi.
 It was a qualifier for the Shoot Boxing World Tournament 1997, featuring four elimination fights with all bouts fought under Shoot Boxing Rules (70kg/154lbs weight class) involving eight fighters from across the world.
 The eight finalists were a mixture of invitees or had been involved in the 1995 tournament (for more information on these finalists, see the bulleted list below).
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.
High Noon in Hong Kong was a World Boxing Organisation sanctioned boxing event.
 It was to feature four fights: a heavyweight title fight between Herbie Hide and Tommy Morrison; Steve Collins versus American Lonnie Beasley for the WBO middleweight title; Billy Schwer would challenge Rafael Ruelas for the IBF lightweight title, plus Frank Bruno versus Ray Mercer in a non-title fight in the Hong Kong Stadium on 22 October 1994.
 It was cancelled at the last minute because of major financial problems.
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.