Question: Picnic at Hanging Rock starred a film actress who was born on 20th of July of what year?

Context paragraphs:
Bethany Whitmore: Bethany Sarah Whitmore (born 7 December 1999) is an Australian actress, best known for portraying Jaden Kagan in the US TV mini-series "The Starter Wife" and also known for her lead voice role of 8-year-old Mary Daisy Dinkle in Adam Elliot's "Mary and Max" (2009), Jane Moochmore in PJ Hogan's "Mental" (2012), Greta Driscoll in "Girl Asleep" (2015), Melissa in "The Family Law" (2016) Seasons 1 & (2017) Season 2 and Blanche in the TV series remake of "Picnic At Hanging Rock" (2017).

The Plumber (1979 film): The Plumber is a 1979 Australian psychological thriller film about a psychotic plumber who befriends a woman.  Written and directed by Peter Weir, "The Plumber" was originally made and broadcast as a television film in Australia in 1979 but was subsequently released to theaters in several countries beginning with the United States in 1981.  The film was made shortly after Weir's critically acclaimed "Picnic at Hanging Rock" became one of the first Australian films to appeal to an international audience.  The film stars Judy Morris, Ivar Kants, and Robert Coleby, all of them being most notable as actors in Australian soap operas.

Vivean Gray: Jean Vivra Gray (20 July 1924 – 29 July 2016), known professionally as Vivean Gray, was an English Australian television and film actress.  Her best-known roles were in soap operas: Ida Jessup in "The Sullivans", and Nell Mangel in "Neighbours".  She retired in 1988, moving to Shoreham-by-Sea, West Sussex, England where she lived a quiet and private life.

Summerfield (film): Summerfield is a 1977 Australian film, directed by Ken Hannam, written by Cliff Green (who wrote the screenplay for "Picnic At Hanging Rock") and produced by Patricia Lovell (who produced "Picnic At Hanging Rock").  It stars Nick Tate, Elizabeth Alexander, John Waters, Charles 'Bud' Tingwell, Max Fairchild and Geraldine Turner.  "Summerfield" was filmed on location on Phillip Island and Churchill Island in Victoria.

Jenny Lovell: Jenny Lovell is an Australian actress, best known for her role as Jenny Hartley in the television series "Prisoner".  She is the daughter of classic Sydney radio and television actor Nigel Lovell and respected actor and producer Patricia Lovell.  Jenny appeared in "Picnic at Hanging Rock" and "Gallipoli" in her early career, the horror film "Darkness Falls" and has performed at The Globe Theatre, London, pursuing her passion for Shakespeare.

Rachel Roberts (actress): Rachel Roberts (20 September 192726 November 1980) was a Welsh actress noted for her fervour and passion.  She is best remembered for her forthright screen performances as the older mistress of the central male character in two key films of the 1960s, "Saturday Night and Sunday Morning" (1960) and "This Sporting Life" (1963).  For both films, she won the BAFTA Award for Best British Actress.  She was also nominated for the Academy Award for Best Actress for "This Sporting Life".  Her other notable film appearances included "Murder on the Orient Express" (1974), "Picnic at Hanging Rock" (1975) and "Yanks" (1979).

Patricia Lovell: Patricia Anna "Pat" Lovell (née Parr), {'1': ", '2': ", '3': ", '4': "} {'1': ", '2': ", '3': ", '4': "} (1929 – 26 January 2013) was an Australian film producer and actress, whose work within that country's film industry led her to receive the Raymond Longford Award in 2004 from the Australian Film Institute (AFI).  Her productions include 1975's "Picnic at Hanging Rock", and "Gallipoli", which received an AFI Award in 1982 as Best Film.

Karen Robson: Karen Robson (born 19 March 1957) is a film financier, producer and actress, best known for her portrayal of the mysterious brunette Irma in Peter Weir's cult classic "Picnic at Hanging Rock".

Helen Morse: Helen Morse (born 24 January 1947) is an English-born Australian actress who has appeared in films, on television and on stage.  She won the AFI (AACTA) Award for Best Actress in a Leading Role for the 1976 film "Caddie", and starred in the 1981 miniseries "A Town Like Alice".  Her other film appearances include "Picnic at Hanging Rock" (1975), "Agatha" (1979), "Far East" (1982) and "The Eye of the Storm" (2011).

Picnic at Hanging Rock (film): Picnic at Hanging Rock is a 1975 Australian mystery drama film directed by Peter Weir and starring Anne-Louise Lambert, Helen Morse, Rachel Roberts, Vivean Gray and Dominic Guard.  The film was adapted by Cliff Green from the 1967 novel of the same name by Joan Lindsay, who was deliberately ambiguous about whether the events really took place, although the story is in fact entirely fictitious.

Supporting paragraphs: Picnic at Hanging Rock (film) Vivean Gray
Answer: 1924