Ok...here goes my NOCD again. I sent Mike's picture to a friend who was able to enlarge it enough to roughly make out the text.
"United Artists & Chartoff-Winkler cordially invite you to a major press conference and cocktails on Monday, August 25, at 4:30pm at the American Film Institute. At this time, you will meet one of the world's most controversial and flamboyant directors, who will discuss details of his American debut."
From 1974 to 1976 most of the major studios were frantically trying to put together "Valentino" themed projects. Mike mentioned that the invitation was possibly from 1975 or 1980...I believe that 1975 is the most likely time frame. It would make perfect sense that United Artists would want to officially announce that they were actively working on a "Valentino" themed project early in the process. (the film was released in the US in October of 1977) Not only do the words "controversial" and "flamboyant" definitely describe director Ken Russell, Valentino was Russell's first major film for the American market.