Gabriella Cristiani assited on two of Betolucci's films including the 1976 film that was screed at what film festival?
Gabriella Cristiani:  Early in her career she assisted editor Franco Arcalli on two of Bertolucci's films, "Last Tango in Paris" (1972) and "1900" (1976). 1900 (film):  The film was screened at the 1976 Cannes Film Festival, but was not entered into the main competition.
1976 Cannes Film Festival