There's a wonderful regular event near where I live called "Nunney Jazz Cafe". It takes place in a village hall, and local jazz musicians of the highest calibre get together and play all Sunday afternoon on a regular basis.
Whole families go, a tasty cheap lunch is served, and good enough jazzers can get up and jam. Some of the kids stay indoors and listen and others play outside when it's warm enough; parents take it in turns to watch the kids or whatever.
It's a fantastic opportunity for members of every generation to hear great jazz in a convivial atmosphere. You get grannies, uncles, aunts, curious people, farmers, bohemians of every description, teenagers, little kids, babies...
Actually I believe it's changed recently and is now mainly tango music, but in a very jazzy vein - still great stuff, especially if you love tango. There's also tango dance sessions where everybody can join in including the kids, who dress up!
These things do need enthusiasts to put it all together, but as has been proved by the Nunney people, if you have the nouse you can do it. Just book the hall, get the musicians, publicise it and away you go.

Check out their website:
Nunney Jazz CafeViolinia