What is the meaning of the following sentence Especially the bold part?

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> From interactive sessions with authors to launches in digital and audio formats, and **bookish games to cover unveiling**, publishers are gearing up to celebrate World Book Day on April 23 amid lockdown.
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 [To read full article](https://www.thehindu.com/books/world-book-day-cover-audio-book-launches-digital-sessions-planned-amid-lockdown/article31411630.ece)