Open Space Technology (or methodology) is a self-organising method that can be used to run meetings for a diverse public in order to address complex topics.
My experience in OS is very limited, that is why I rely a lot on picking the brains of those who do this type of facilitation for a living. There are also some good websites like this one recommended by Tom http://www.openspaceworld.org/

by Johanne Lortie

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