[Read about the events that our other critics have chosen for the week ahead.]

‘PORGY AND BESS’ at Film at Lincoln Center (Sept. 19, 7 p.m.). How rare is this screening of Otto Preminger’s 1959 film version of “Porgy and Bess,” starring Sidney Poitier and Dorothy Dandridge? “It’s virtually a lost film,” said Foster Hirsch, a film scholar and the author of a book on Preminger who will participate in a panel discussion before the movie is shown. Even if a theater could track down one of the very few known prints capable of circulating (one is locked up at the Library of Congress), there is the difficulty of clearing the complicated rights, which Hirsch said he did for two New York screenings in 2007, a screening in Cleveland in 2016, this screening and another on Nov. 3 at the AFI Silver Theater outside Washington. The stakeholders have kept the film under wraps for various reasons. Hirsch noted about Ira and Leonore Gershwin, in particular, “I think they had objections to the musical treatment, and the fact that the leads are played by actors who don’t sing the roles. The voices were dubbed. So they felt it wasn’t authentic to George Gershwin’s original vision.” Viewers won’t have to go too far to make a comparison: This showing is being timed to a revival of “Porgy and Bess” that opens at the Metropolitan Opera on Sept. 23.

212-875-5601, filmlinc.org

PURPOSE AND PASSION: THE CINEMA OF JOHN SINGLETON at BAM Rose Cinemas (Sept. 13-20). The director of “Boyz N the Hood” (showing on Friday, Wednesday and Sept. 20), who died in April at 51, began his career by becoming both the youngest person and the first African-American to be nominated for a directing Oscar. He left behind nine features, all showing in this series, and the maturity he showed in his work during his 20s and 30s is startling. The films he made at that age include “Rosewood” (on Saturday), a sweeping dramatization of a real 1923 incident in which a mostly black Florida town was destroyed by a lynch mob, and “Baby Boy” (on Sunday), his portrait of a man (Tyrese Gibson) in South Central Los Angeles who — through a combination of his own decisions and societal strictures — effectively lives in a state of arrested adolescence.

718-636-4100, bam.org