yeah it sounds like what you are looking for is an organised play group session run by some sort of community group. have a look into places like churches, universities that run teaching courses, YMCA, maybe C&K. you could even go to a music themed place such as kinder musik, kinderdance, forte music etc that run little sessions for the kids related to music/dance etc. sometimes your council library has story telling days and you could easily become friendly with the parents and kis that go there. ummm... cant think of any ideas at the moment bt it sounds like the play group you go to at the moment are more for the parents which is fine but doesnt sound like what you are looking for.