Someone nicely asked if I went again, or elsewhere, so I'm posting a sequel
I found the exact same situation of a club discussing a book I'd read in the past, leaving me curious about what they'd say. Except this time it was quite a distance, taking me a long time to get there. I called beforehand, just to make sure it would be all right, and was welcomed very cordially. The book was the scifi novel, The Left Hand of Darkness, by Ursula LeGuin, which for me is notable for having the startlingly unique premise of a society that is asexual most of the time, then briefly sexual, like estrus - but the gender may change and the person has no control over it, nor any knowledge of what gender he/she may be next time!
This one was at a library, although I don't think it was run by the library. It was BIG compared to my first one, about 20 people. And had a few men. We were at long tables moved to form a square, and, as before, I politely said I was happy to sit in a corner and listen, but the two moderators said, No, no, sit right here and join in. Despite the size, it worked better than I would have expected. They began with the suggestion of going one by one around the circle, with everyone introducing themselves and commenting briefly.
Then they were off and running. It was fun. I must say that it was all about the premise and the ramifications of the gender situation, nothing about the style, or the book-as-book. Interestingly, many people spoke of it in terms of contemporary relevance, which hadn't occurred to me. Weirdly, several people admitted to not finishing the book (and in one or two cases, not having actually read it at all). It was, oddly, much more participatory than my first experience, which is the opposite of what I expected. I mean, I would have thought the smaller group would have been speaking up more readily. But even though this involved speaking across the considerable distance of the square of tables, everyone was pleasantly assertive, mostly sensible, and occasionally astute. (One guy said something I didn't agree with at all, that the book had been very influential, making connections to Star Trek and such, which I find dubious at best.)
Anyway, the one thing both groups had in common was that they were very cordial to an intruder! In fact, I was even offered a ride home, since I came from so far. (No, I didn't take him up on it, but I did accept a ride to the bus stop.)