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‘Gilligan’s’ Sets Sail: “Gilligan’s Island: The Musical?” has opened in Chicago, offering everything the television series had and more. The goings-on include a spaceship landing, a rocket launch and a hurricane, all swirling around those seven familiar castaway characters from the TV sitcom. Critical reaction so far has been lukewarm. The Chicago Tribune called it a “mildly amusing diversion . . . neither as bad as it might have been nor as much fun as one wants it to be.” Sherwood Schwartz, who created the TV series, produced and co-wrote the musical with his son, Lloyd.