With four productions a year—in the 2017–2018 season they included Tosca and The Threepenny Opera—the BLO works hard to make opera accessible, offering two-show subscriptions and a few $25 tickets at each performance, and even reassuring guests that it’s OK to wear jeans. Productions are held at the Cutler Majestic Theatre, Huntington Theatre, and Cyclorama at the BCA.