1. Book Release Campaigns: When the original books were released, promotional campaigns likely involved book signings, author interviews, and reviews in newspapers and literary magazines. C.S. Lewis did have also engaged in public readings or talks about the series.

2. Film Adaptation Campaigns: The "Chronicles of Narnia" book series has been adapted into several successful films. Each film release was accompanied by extensive promotional campaigns, including trailers, posters, and interviews with the cast and crew. These campaigns aimed to generate excitement and interest in the movies, especially among fans of the books.

3. Merchandise and Tie-Ins: To capitalize on the popularity of both the books and the movies, various merchandise and tie-in products have been created, including action figures, clothing, and themed merchandise. These items are often promoted through marketing campaigns and partnerships with retailers.

4. Online and Social Media: In more recent years, online and social media platforms have played a significant role in promoting "The Chronicles of Narnia." Official social media accounts, websites, and fan communities have been used to share news, trailers, and engage with fans.

5. Releases and Anniversaries: Special editions of the books or film collections have been released on significant anniversaries of the series. These releases are often accompanied by marketing campaigns highlighting the historical importance and enduring popularity of "The Chronicles of Narnia."

6. School and Library Outreach: Given the series' popularity among young readers, promotional campaigns have also targeted schools and libraries. This includes author visits to schools, reading challenges, and the distribution of educational materials related to Narnia's themes.

7. Partnerships and Collaborations: Sometimes, promotional campaigns involve partnerships with other brands or organizations. For instance, there did have been tie-ins with educational programs, charity initiatives, or cultural events.