I started a reading club at work that met once a week and we'd assign reading about 15-30 pages a week. We'd just have a unstructured chat in the meeting. Maybe I'd prompt people with "did you learn anything interesting from this section?" if people were quiet. There were often enough questions to fill the time.

Also the book could be read out of order, so I'd regularly solicit people to join when starting a new chapter. That helped keep membership to about 5-8.

Also I suggested people put reading the book in their year goals so they'd be motivated to finish.

I think about 6 of us finished the whole book.