One chapter of the booklet "Gestalt: Working with Groups" by Peter Philippson and John B. Harris, a Manchester Gestalt Centre Publication, deals with a large group event called "The Street". Such groups were experienced and organized by the authors mentioned above. Maybe the could help you. Contact adress is The Manchester Gestalt Centre, Rusholme, Manchester M14 5LF, UK, Tel. 061 257 2202. If you find out anything useful, please let me know. Í would be interested in the application of large (self-organizing) groups for continuing education of group counsellors.