Read any book you want to and meet up to talk about them, simple! Read as much or as little as you want it's really a conversation group so if you've not finished that 500 page biography it's all good. Honorable mentions from the previous meetup:
---Books---
Designing Your Life: How to Build a Well-Lived, Joyful Life, Burnett
Becoming Better Grownups, Montague
If Anyone Builds it Everyone Dies, Yudkowsky
Looking For Alaska, Green
Falling in A Sea of Stars, Britain
Unshackled: The Seven Levels of Business Excellence, Young
Zen to Go, Winokur
The Seven Habits of Highly Effective People, Covey
---Film, Musicals, Websites, TV and Stuff to Do---
The Social Dilemma, 2020
Reservoir Dogs, 1992