This film screens in the BFI Love: The Power of Love season strand. You can find the full details of the season here and you can find the details for this film's screening on this date and on December 22nd here.
Chicago Reader review:
Jacques Demy's 1964 "film opera," with music by Michel Legrand, has a reputation for sappiness it doesn't deserve. The chief feature of Demy's direction is his deft avoidance of the pat, the obvious, and the sentimental, which is no mean feat when you're dealing with material as self-consciously simple as this. Catherine Deneuve loses her fiance to the draft; he's wounded and doesn't write, so she reluctantly marries someone else.
Here (and above) is the trailer