The Metropolitan Opera continues its free nightly streams via Met Opera on Demand (search for it online). This week’s theme: “City of Light.” Each performance is available to stream for 24 hours, starting at 7:30 p.m.: Massenet’s Manon on Thursday, April 29th; Verdi’s La Traviata on Friday, April 30th; Cilea’s Adriana Lecouvreur on Saturday, May 1st; and Puccini’s La Rondine on Sunday, May 2nd.