At the Nehru Centre in Worli, the mellifluous strains of Marathi natya sangeet will accompany old-style costume dramas this week, in the cultural venue’s Sangeet Natak Mahotsav. Groups from both Pune and Mumbai will stage their productions, and the Nehru Centre itself has produced the event’s opening act, Sagar Saath Surancha, written by Pradeep Oke and directed by Pramod Pawar. …