The cast of “Albert Herring,” Benjamin Britten’s comic opera about a reluctant king and his pushy mother, is shown in rehearsal for the Princeton Festival’s production to be held under a tent at Morven Museum June 17 and 19, with Princeton Symphony Orchestra conductor Rossen Milanov on the podium. Cast members include local talent from Westminster Choir College and Westrick Music Academy, along with professionals from the U.S. and Europe. For tickets, visit princetonsymphony.org/festival.