If you were to hang around Montmartre after sundown in the 1920s & 30s, it’s likely you were looking for something a little more Avant-Garde than what you might find on the Parisian Left Bank. At the time, it was a haven for struggling artists, bohemians, burlesque dancers, and straying husbands as well as a vibrant gay & lesbian community. In Montmartre, they…