1927 was an important year.
The year that Whiteheads talk _ Religion in the Making_ was published where he introduced the word 'creativity'. source
The year J. C. Smuts published _Holism and Evolution_ introducing the concept of holism based, in part, on his study of Walt Whitman. wikipedia
The year Louis de Broglie introduced the theory of pilot wave, that which laid the foundation for an alternative quantum model developed by Bohm. wikipedia
The year that Martin Heidegger published _Being and Time_ where he introduced the concept of 'ontic', one that has similarities to 'actual occasions' that Whitehead talks about.