Which innovative product marketing strategy is credited with transforming the 'Harry Potter' series from a modestly successful children's book into a global publishing phenomenon?

In the world of books and publishing, marketing innovations have transformed how we discover and consume literature. From subscription boxes to viral campaigns, publishers have found creative ways to connect readers with authors. This trivia question explores one of the most significant marketing innovations that revolutionized the book industry and created a cultural phenomenon. Test your knowledge of how a specific marketing strategy transformed a niche genre into a global sensation!

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• Midnight release parties with themed events and costumes
• The simultaneous release of adult and children's cover designs
• The 'Golden Ticket' contest that placed winning tickets in random books
• The interactive website where readers could get 'sorted' into Hogwarts houses

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