The Metropolitan Museum of Art Costume Institute advantage, where VIPs spruce up in excessive outfits to eat at the Met however don’t burglarize it, is this evening. Referred to informally as the Met Gala, it resembles an entertainment pageant without the honors — unadulterated, unadulterated celebrity main street. This year, the topic is camp. It’s an elusive thing to characterize! The clothing regulation: “considered detail.” Expect the unforeseen.