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Creating a publishing calendar that aligns with holidays and special days relevant to the publishing industry is a great idea to plan your content and marketing efforts effectively. Here's a list of holidays and special days that are relevant to the publishing industry:

1. National Book Day (January 9): Celebrate the love of books and reading.

2. World Book Day (April 23): A global celebration of books and authors.

3. National Library Week (April, first full week): Promote library resources and services.

4. International Children's Book Day (April 2): Focus on children's literature.

5. Independent Bookstore Day (Last Saturday in April): Support local bookstores.

6. Free Comic Book Day (First Saturday in May): Celebrate comic books and graphic novels.

7. National Poetry Month (April): Highlight poetry and poets throughout the month.

8. Banned Books Week (Last week of September): Raise awareness about censorship and banned books.

9. National Novel Writing Month (NaNoWriMo) (November): Encourage aspiring writers to participate in the challenge.

10. National Author's Day (November 1): Recognize and appreciate authors' contributions.

11. World Kindness Day (November 13): Promote books that inspire kindness and empathy.

12. National Reading Day (November 29): Encourage reading among all age groups.

13. Book Giving Day (February 14): Gift books to loved ones or those in need.

14. National Grammar Day (March 4): Emphasize the importance of proper grammar and editing.

15. World Intellectual Property Day (April 26): Discuss copyright and intellectual property in publishing.

16. National Editors' Day (March 4): Recognize the vital role of editors in the publishing process.

17. National Poetry Day (Second Thursday in October, UK): Promote poetry and poets.

18. World Storytelling Day (March 20): Celebrate the art of storytelling in books and other media.

19. National Comic Book Day (September 25): Focus on the comic book genre.

20. National Publicist Day (March 4): Acknowledge the work of publicists in promoting books.

21. National Scrabble Day (April 13): Highlight the importance of words and language.

22. National Science Fiction Day (January 2): Explore the world of science fiction literature.

23. National Book Lovers Day (August 9): Celebrate the love of reading and books.

24. World Literacy Day (September 8): Promote literacy and access to books worldwide.

25. Book Launch Anniversaries: Consider celebrating the release dates of significant books in your niche.

26. Major Literary Awards: Plan content around the announcement dates of prestigious literary awards like the Pulitzer Prize, Man Booker Prize, National Book Awards, etc.

27. Seasonal Themes: Tailor your content to seasonal events like back-to-school, summer reading, or holiday book gift guides.

Remember to adapt this list to your specific publishing niche and audience. These holidays and special days can be excellent opportunities for themed content, promotions, and engagement with your readers and customers.