Professional artists and more than 300 amateur members of the Los Angeles musical community gather under the baton of James Conlon to present two free, family-friendly performances of Benjamin Britten’s “Noah’s Flood.” Professional vocal soloists including baritone Ben Lowe as Noah, mezzo-soprano Peabody Southwell as Mrs. Noah and bass-baritone Patrick Blackwell as the Voice of God. They are joined by {…}