Grease fans were treated to a surprise they’ll never forget when John Travolta showed up in character as Danny Zuko—leather jacket, swagger, and all. Fans at Friday night’s “Grease” sing-a-long at the ...

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Fans at Friday night’s “Grease” sing-a-long at the Hollywood Bowl thought they were in for a fun night of nostalgia. What they got instead was a full-blown, once-in-a-lifetime surprise—John Travolta, ...