I have organised the following event.
'What is capitalism and what are the alternatives?' Discussion Tuesday, 8th Nov at 14:00 Occupy the London Stock Exchange St Pauls
Caroline Lucas has been down to speak a couple of times.
Incidentally my argument is for common pool property rights see Karl Marx and Elinor Ostrom.
A good discussion can be found here if this is a new concept http://www.thecornerhouse.org.uk/resource/reclaiming-commons
And I wrote a think piece here for the Sustainable Development Commission http://www.sd-commission.org.uk/publications.php?id=771