I am reviving this thread, as I am coming to Athens for http://commons.gr beginning of October and investigate contacts to get in touch with during this time.
I am actually based in Thessaloniki, not Athens.
I might travel to attend the commons festival in October, not sure yet.
There are many interesting people I could refer you to, but they will be among the organisers of the conference. Chances are you will meet them there.
I have now finally booked my travels to Athens and would be glad to receive your recommendations about whom to talk to, once there. Will we also be able to meet?