I run open Knowledge Cafés in London and Farnborough in the UK several times a year, and I frequently run them in other countries around the world during my travels. The London Cafés have been running since September 2002.
I usually hold them in the evening from 18:30 until 21:00. They are open to the public and are entirely free.
Unlike a Café held in an organizational setting, open Knowledge Cafés are usually larger (30 – 60 people compared with 12 – 24), and their purpose is more of a learning/social one.
You can learn about planned events and register for them or sign up for the mailing list on the Gurteen Knowledge Community website.
And see here for details if you are interested in sponsoring one.
A Gurteen Knowledge Café held at the SMARTlab University of East London, England. October 2006.