Eun Sun Kim, music director of the San Francisco Opera, embarks on a multiseason exploration of the Wagner canon. Lohengrin tells the medieval legend of a deceased duke’s heiress who is falsely accused of murder and of the White Knight who arrives by swan-drawn boat to save her. In many ways, it’s the master’s most conventional, even his stuffiest, production, cast in the mold of grand opera as practiced in Paris (minus the obligatory ballet). Yet its grandiloquent public confrontations and tingling private melodrama can be totally thrilling. Simon O’Neill is Lohengrin, the mysterious savior from afar, opposite Julie Adams as Elsa, the maiden in distress. Judit Kutasi and Brian Mulligan are out to destroy them as the wicked Ortrud and Telramund. David Alden directs. The performance on October 21 streams live in real time, with a 48-hour window for encores on demand opening up on October 22, 10 A.M. Pacific. —Matthew Gurewitsch