The point of a book club is to read the book together and debrief thoughts, feelings, and ideas from the book. This is both a debrief as much as it is a collaboration. The groups’ members collaborate about the book and the book's story and information.
When a book club does not need to read a book, is it still a book club anymore? Is it a club? What if the goal is for half the people in the group to read the book and the other half to not read the book? Then the group collaborates on the ideas of the book. Half the group unbiased by the book and the other half of the group biased from the perspective of the book.
Or what if the point of the book club is to hang out, make friends, drink wine, and talk about a book? Some people read the book, some people started but did not finish, and some people didn't read it at all.
How about the book club where it is two people talking on a stage or in a video or on a podcast. Nobody else has to read the book. Is this even still a book club?
Book clubs have a certain mutuality, participation, and collaboration to them. The final idea is more than the book's content. It is a meta about the book as content for consumption through conversation. Thus people are making content about content and selling it to make money. Someone could even then start a club around the content the debrief and collaborate over. Thus having a club about the book club.
How are you labeling your meetings, content, projects, products, work, and free time? Are you giving them the right labels? Is your free time actually used for work? Is that meeting you are leading actually a meeting or is it an educational session? Are you putting the right labels on your work? Are you communicating the correct expectations?