There was actually a series of meetings from late July till late August. There were many retired members and associates in Acapulco. These are the topics, 1) Narcotics which had many Bonanno, Gambino, Sicilians, Calabrians, Toronto, Montreal, and Mexican members. 2) Legalizing Gambling in Quebec and Mexico, there were gambling casino in Mexico mob owned, but the bribes were getting steep were a few shutdown. A) There was the issue with Agua Caliente Resort which a number of families had interests in namely Los Angeles, Chicago, Detroit, Cleveland, and Genovese. B) Hipodromo de las Americas in Mexico city also had issues. 3) Mexico ports custom agents and projects. 4 ) There were a number hits that the families and groups wanted to kill, only two were approved, while Agua Caliente Resort would only suffer a fire at the track after a series of meeting in 1970 and early 1971 where they finally backed off with Two other casinos following pursuit. 5) The FC wanted to give more power to their Mexican workers in the narcotic trade, this is the first major sign of Mexican Cartels forming, although it would be a few more years before they popped on the scene, but they were already gaining power by the late 1960s.

This is a incomplete list and I'll only give a partial of the attendees cause they went to different meeting during that time but they were all in Acapulco at the same time.
Bonannos- Vic Cotroni, Frank Cotroni, Paul Violi, Angelo Caruso (had a lot of power and influence in Mexico) Joseph Buccellato for his uncle Evola, Nick Zaffarano, two other unidentified members
Buffalo-John Papalia, Dante Gasbarrini, Vincent Luppino
Corsicans- Tommy D'Agostino, Frank Spirito, Guido and Joe Orsini, Paul Mondolini
Chicago-Johnny Roselli, Marshall Caifano, Louis Eboli, 3 unidentified members
Los Angeles- Michele Marchese, Angelo Marchese, Salvatore Sciortino, 2 unidentified members from San Diego.
Toronto- Benny Smith, Tony Perri, Carlos Gatto, a dozen more
Montreal- Irving Ellis, Raymond Daourt, a dozen more

It is a who is who in the underworld at that time. Meyer Lansky and his brother Jake attended the casino meetings, some others were Sylvestro Carolla and his son Anthony from New Orleans along with Joe Poretto, Peter Licavoli and Bill Taco of Detroit to name some of the others. During that time there were many members on the scene.