A singular departure this year at summer’s end. Hubbard Hall Opera Theatre (of Cambridge, New York), the dream-child of Alexina Jones, has lost its creator and mentor. She goes on to a position with Saratoga Arts. This young women is an intrepid creator. She built a company from nothing, fit it into the seasonal circumstances of Hubbard Hall, and with the help of her husband, Jason Dolmetsch, plodded through hundreds of hours of planning, auditioning, fund-raising. The Company started out in a modest way—a few instruments, mostly local singers. One of the first of these singers, Kara Cornell, turned in a Carmen that was utterly believable. Watching an opera of this sort in a small hall requires detailed specific acting; the grand gestures seem absurd.