Scenes recorded for the film but not included in the final version. The final version is here: http://www.williamgreaves.com/first-world-festival-negro-arts/.
To watch the silent outakes from that film, click on the images below. Outakes archived on https://archive.org/details/306-7725x-7. Public Domain material, from United States Information Agency [USIA] collection at National Archives and Records Administration [NARA]. Movie stills from Internet Archive.
In order to find out who and what is shown in these pictures, here is the calendar of events, 1st-24 April 1966: https://fman.huma-num.fr/s/dictionnaire/page/calendrier.