Dance artist Rachel Linsky is debuting her new work, “Hidden,” the latest in her ongoing choreographic series that aims to preserves stories of WWII Holocaust survivors through dance, at the Boston Center for the Arts Plaza Black Box Theater in the South End. Three performances are scheduled: Thurs., Oct. 20, and Fri., Oct 21, at 7 p.m., and Sat., Oct. 22,at 6 p.m. Dorchester