The Longmont Community Justice Project in Colorado is a non-profit organization promoting restorative justice in their community.  Here is an excellent video - only 16 minutes long - for you to view (allow a few moments for it to appear below).  It will give you an excellent introduction to what is variously call a "justice circle" or "circle justice" or "native/indigenous circle" or "circle conferencing".  To view, click on the play arrow in the middle of the screen.  For full-screen viewing, click the small TV icon, bottom left of the screen.