Article about the show at Olympia, Paris - October 26, 1968.

Source: Javier Marcote 

The Real Frank Zappa Book, p 106: "The first time we played with Rahsaan Roland Kirk was at the 1968 Boston Globe Jazz Festival. After his performance, when introduced to him backstage, I said I really liked what he was doing, and said that if he felt like joining us onstage during our set, he was more than welcome. In spite of his blindness, I believed we could accommodate whatever he wanted to do. We began our set, wending our atonal way toward a medley of 1950s-style honking saxophone numbers. During this fairly complicated, choreographed routine, Rahsaan, assisted by his helper (can't remember his name), decided to join in."

On page 21 is a picture of FZ, Roy Estrada, Rahsaan Roland Kirk and his helper (Kirk Quartet's drummer Jimmy Hoppes?) on stage.

Source: Javier Marcote 

On the Newport Jazz Festival FZ and MOI played on Saturday morning, July 5th. Before that in June they participated in a jazz tour.

The Real Frank Zappa Book, pp 106-107 : "In 1969, George Wein, impresario of the Newport Jazz Festival, decided it would be a tremendous idea to put the Mothers of Invention on a jazz tour of the East Coast. We wound up working in a package with Kirk, Duke Ellington and Gary Burton in Miami at the Jai Alai Fronton, and at another gig in South Carolina.
[...]
Before we went on, I saw Duke Ellington begging – pleading – for a ten-dollar advance. It was really depressing. After that show, I told the guys: 'That's it -- we're breaking the bande up.'" 

Source: Javier Marcote  

This article is the "jazz's view" of Amougies Festival.

Source: Javier Marcote  

Source: Javier Marcote  

Article on "Amougies in two films"
There is an interesting phrase when FZ introduced Captain Beefheart show.

"Listen well, even the silence, for fear of missing something important

Source: Javier Marcote  

Article on "Hollywood Palladium show" March 27, 1973

Source: Javier Marcote  

Source: Jérôme Munnier and slime.oofytv.set