“Pierre Audi, who recently became the artistic director of the Park Avenue Armory [in New York], has been named the next director of the Aix-en-Provence Festival in southern France, … Mr. Audi, a stage director and impresario known for fostering contemporary work and for projects of daunting ambition, has led the Dutch National Opera for three decades. But he’ll give up Amsterdam for Aix in 2018.”