Not something I have come across in New Zealand, although perhaps Rotary Clubs, Churches could almost be seen as a form of Giving Circle.
For those unfamiliar with what a Giving Circles is, this from an artiles on Nonprofit Quarterly sums what they are quite well.
Giving circles are voluntary groups that enable individuals to pool their money (and sometimes their time as volunteers) to support organizations of mutual interest. They also provide opportunities for education and engagement among participants about philanthropy and social change, connecting them to charities, their communities, and each other.
Have a read of the full article, Could Giving Circles Rebuild Philanthropy from the Bottom Up?
I feel there’s room for organisations to look at how they could help people to understand Giving Circles and use them to help build awareness of the work done of their organisation and, yes gain support.
Do you know of any Giving Circles in your area?