Probably it was given at the Esalen Institute at Big Sur, California, where Feynman regularly gave lectures: http://books.google.com/books?id=j42RD66g72oC&pg=P

Probably it was given at the Esalen Institute at Big Sur, California, where Feynman regularly gave lectures: http://books.google.com/books?id=j42RD66g72oC&pg=PT384&lpg=PT384&dq=richard+feynman+esalen+institute&source=bl&ots=fCtf90wL2p&sig=X-KBbC1fvtm5pA2BcAH63i-1qzo&hl=en&sa=X&ei=C0gwU9mVB9L5oASxyIKoBA&ved=0CCcQ6AEwATgK http://books.google.com/books?id=j42RD66g72oC&pg=PT384&lpg=P...