You might figure that in the Comic-Con era of elaborate spectacles, “Jaws” would have loosened its hold on our imagination. Not really, judging by the thousands expected to attend Jawsfest: The Tribute, a fan gathering being held Aug. 9-12 on Martha’s Vineyard. (The movie also arrives on Blu-ray Aug. 14.) What makes “Jaws” a classic? The reasons are as familiar as that iconic poster of a great white shark about to show a skinny-dipper the true meaning of risky.
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