These are starting to sound like a Chavurah. (see this http://en.wikipedia.org/wiki/Chavurah ) Many of my Jewish friends have a formal agreement with a group of families in which they gather for holidays and important family events, such as birthdays, graduations, etc. Sort of an extended family role, with a Jewish umph...When one is without an extended family nearby (for whatever reason), Chavarot provide a context to participate in the cultural aspects of Judaism.
1) I'd bet these "book study parties" are not sanctioned "from above"
2) I'd also bet that if they get too widespread someone is gonna put the kabosh on them.
3) And, using their circular logic, this makes them a good thing, which means the society won't like it, which means they will have to stop, which means they were a good thing to start with, anyway...
Back in the 70s, a new elder and his family with a ton of kids moved to our congregation. They hosted our bookstudy and every week provided goodies for the entire group after the meeting. It was kinda nice (and where I discovered the "Wheat Thin"). They also had one congregation party, where they went all out with plans for fun things to do for all the age groups.
That was the only party, and for some reason the book study was disbanded. I don't know that I ever knew why, or even wondered why. That was a nice family, and I suspect he was a "good elder." They eventually moved on.
Shoshana