We never meet young Richie and Lonna, whose marriage is on the rocks. But miles and miles away, in the affluent southwestern suburb where their parents live, this couple’s separation is disturbing the tranquility of a community they’ve barely met. In Dan LeFranc’s comedy of anxiety and awkward neighbors, the residents of Rancho Viejo drift from one gathering to the next, wrestling life’s grandest themes while fending off existential despair — set against the lustful, yearning strains of a distant bolero.