DOWNTOWN BROOKLYN — The Brooklyn Book Festival held its special day just for kids on Saturday at Borough Hall, and the perfect weather, fun activities and top-flight authors and illustrators brought out the crowd. Events included readings, book signings and hands-on workshops, with books for sale in the marketplace.

The happenings included co-authors Ruta Sepetys and Steve Sheinkin signing copies of their New York Times best-selling historical mystery novel, “The Bletchley Riddle” for a line of young fans. (The book follows a brother and sister unraveling a mystery at Bletchley Park, the secret center of Britain’s codebreaking program during World War II.)

Co-authors Ruta Sepetys and Steve Sheinkin signed copies of their best-selling historical mystery novel, “The Bletchley Riddle,” at t

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