Which publishing innovation, first widely implemented with J.K. Rowling's Harry Potter series, revolutionized book retail strategy by turning release dates into major cultural events?

In today's publishing world, successful book series are often transformed into multimedia brand empires. The strategic decisions behind these expansions can make or break a literary franchise. This trivia question explores one of the most significant brand strategy decisions in modern literature that revolutionized how books are marketed and expanded into other formats.

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Midnight release parties with themed merchandise and activities
Celebrity author podcast interviews released simultaneously with the book
Digital-first publication strategy with print editions released months later
Subscription box model delivering books with exclusive collectibles