Boston Lyric Opera opens its new season on Oct. 1  with Mascagni’s “Cavalleria Rusticana.” The company will showcase the production at the Leader Bank Pavilion in Boston’s Seaport District in order to ensure the safest possible performances for audience members, artists, staff, and backstage workers. The Pavilion’s open-air structure allows BLO to produce large-scale live performances, with a full live {…}