(Photo credit: Marco Borggreve, Christopher Pledger, & Robert Workman) The recently updated 200-seat chamber hall at Pembroke College Cambridge welcomes baritone Sir Simon Keenlyside on Oct. 5 and mezzo-soprano Dame Sarah Connolly on Nov. 1. Keenlyside opens the Bliss International Song Series with Schubert’s “Winterreise.” Connolly follows with selections by Brahms, Mahler, Frank Bridge, and Edmund Rubbra. Artistic Director Joseph {…}