Based on Victorien Sardou’s 1887 French-language play, Giacomo Puccini’s Tosca of 1900 is one opera that few directors choose to set in anything other than its original time and place. There are exceptions to this rule, but when all of the action can be linked to a real historical event on a precise date, there are certainly advantages to retaining the intended setting, and many risks associated with changing it. The entire story takes place during the afternoon,...