Question: once upon a time in hollywood is it based on true events?
Answer: Quentin Tarantino's Once Upon a Time in Hollywood is a fictional film, but the tale of late-1960s L.A. includes many real-life figures. Among them are actress Sharon Tate, played by Margot Robbie, and cult leader Charles Manson, who orchestrated the 1969 murders of Tate and eight others.