It's not hard to think of a couple of research questions that involve them performing tricks. You might as well invite people to watch the research as it happens.
(I'm not suggesting that they should do this, just that they will. "Research" can be an easily abused loophole. Just look at Japan and their whale "research".)
"Performances" by dolphins at the Vancouver Aquarium for several years have been feedings, and demonstrating research techniques (e.g. attaching and removing suction based sensors and tools, demonstrating how the animals have been trained to allow blood and other samples to be taken safely, etc). I still maintain my membership at the Vancouver Aquarium because I approve of pretty much all of their rescue programs, even though the breeding and in particular the Beluga program has been problematic in the past.
I am not a fan of keeping wild animals in captivity, but I am very much in favor of the types of rescue programs like those run by Vancouver Aquarium (and of captive breeding programs for at-risk, endangered, and extinct in the wild species).
