Café society was the description of the "Beautiful People" and "Bright Young Things" who gathered in fashionable cafés and restaurants in New York, Paris and London beginning in the late 19th century. Wikipedia

Fashionable lifestyle. Wikipedia Disambiguation

Especially from the late-19th century through the mid-20th century in Europe and America, a culture characterized by continual socializing in bistros, coffee shops, and nightclubs, sometimes extravagantly frivolous and sometimes intensely intellectual in nature but always high-spirited. Wiktionary