The Book group I belong to has been running for nearly twenty years, with eleven original members; the twelfth moved a hundred miles away. We meet once a month in each other's houses, coffee and biscuits only, and choose our books by trying to read something from every genre, classics, modern, fiction , non-fiction, with science fiction proving the most difficult.
We start by going round the group with a very brief resume of people's opinion of the book, strictly no interruption or discussion until everyone has had a chance to say something, then launch into a general discussion, which usually lasts about an hour. If we are not able to attend we send in our thoughts by email or scribbled notes. Once a year we have a celebratory lunch.
We use the local library or buy our own copies; you can spot Book Group titles in the charity shops. I have read so many books I would never have looked at previously, (and some I would never read again) and think we all really enjoy the meetings and get a lot from them. Husbands and family members hide well away and cannot believe the amount of noise we make!