The Mainstay is observing the flavor and excitement of Mardi Gras on a special Fat Tuesday (February 21st) 7 P.M. show. Philadelphia-based James Day and the Fish Fry perform all styles of New Orleans Music: A Gumbo mix of Street Parade music, Cuban Rumbas, Swamp Pop, Zydeco, and New Orleans Classics. It’s all there in the pot: backbeat drumming, slapping upright bass, fat tone guitar, squeezing accordion, honking saxophone, scratchy frottoir, Cajun fiddle and ripping harmonica.