In a note to the introduction of The Open Society and its Enemies, Popper frankly acknowledges that the distinction between closed and open society is derived from Bergson’s Two Sources of Morality and Religion (first published in 1932 as Les deux sources de la morale et de la religion
Fascinating. A fan of Oakeshott, I published a short article comparing him to Dewey. Let me know if you're interested.
It's my teaching heavy part of my academic schedule, so I can't promise to get around to it quickly. But feel free to send me anything.
Eric