Pictured below is the Bishop with altar serves of the Campus Ministry Mount Saint Mary's College following the "Closing Liturgy" in a past edition of the Los Angeles Religious Education Congress. [Source]
Fr. John Zuhlsdorff notes that Bp. Zavala also presided over the closing liturgy of the "Three Days of Darkness" Education Conference in LA a couple years back. Who could forget?
And, yes, Fr. Z also called this, back when it happened, "reason #65648 for Summorum Pontificum," be that as it may.