I ran into this (the title translates as ‘The Lovely Month of May’) on Turner Classic Movies. I’ve missed most of it but what I’ve seen is fantastic. It’s listed in Netflix as “SAVE” so aside from seeing it on TCM again, I’m not sure where you would find it. Here’s the trailer.
"A far-reaching meditation on the relationship between individual and society" (Film Comment), LE JOLI MAI is a portrait of Paris and Parisians shot during May 1962.
It is a film with several thousand actors including a poet, a student, an owl, a housewife, a stockbroker, a competitive dancer, two lovers, General de Gaulle and several cats.
Filmed just after the March ceasefire between France and Algeria, LE JOLI MAI documents Paris during a turning point in French history: the first time since 1939 that France was not involved in any war.
ETA - you can rent or buy on Google Play (and I bet iTunes too).