NEW ORLEANS — Biennials, triennials, and other, similarly grand periodic art exhibitions are a funny thing; both local and global, they must balance an engagement with their home places alongside a broader artistic conversation. “For these kinds of exhibitions to be successful, they have to have some relationship to where they are,” Franklin Sirmans, artistic director of the current and third iteration of Prospect New Orleans, told The Art Newspaper last fall. How Sirmans has gone about achieving that relationship in his show, Prospect.3 (P3 for short), as well as how successfully, is open to debate; a good chunk of the triennial consists of static work arranged in ways that don’t feel particularly enlightening inside established artistic institutions, where its connection to the larger world feels minimal. (Comparisons to Prospect.1 are inevitable, if not entirely fair — like pitting a current partner against a first love.) Among the exceptions, however, are two exhibitions at the Ogden Museum of Southern Art.