St. Joseph’s Cultural Center will present the Grass Valley debut of PLOTZ! a Balkan-jazz-rock band from Los Angeles Saturday. PLOTZ! tips its hat to styles, stories and influences from all over the world, while maintaining firm roots in Balkan folk music, jazz and rock. PLOTZ! features some of Los Angeles’ most innovative and virtuosic rising stars and has been a fixture on the underground Los Angeles Balkan/gypsy scene for almost a decade, according to the band. The group features Daniel Rosenboom on trumpet, Gavin Templeton on alto saxophone, Brian Walsh on clarinet and baritone saxophone, Jake Vossler on electric guitar, …