PEOPLE is on the ground—and on the star-studded red carpets—in Cannes! We also chat with PEOPLE movie critic Tom Gliatto to get the scoop on LeBron James' 'Space Jam: A New Legacy' and what else you've gotta watch this weekend. Then, PEOPLE editor Liz McNeil helps us look back at the Chappaquiddick tragedy that took Mary Jo Kopechne's life over 50 years ago and how the Kennedy family was involved.

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