In 2007 Led Zeppelin reunited for its first headlining show in 27 years — a charity fund-raiser for the Ahmet Ertegun Foundation at London’s O2 Arena. More than 20 million people entered a lottery for tickets, but only 18,000 got them. For those lucky few it became “Celebration Day,” which is also the title of the new, long-delayed movie from that performance.
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