Worth noting that the Seasonal Events, which initially were fairly cookie-cutter, are getting increasingly intricate. The team on them has had access to steadily-improving tools, allowing the events to be developed in more interesting ways.
Here's a presentation on it from the last Fanfest:
https://www.youtube.com/watch?v=uqiSAfH4h0sAlso, worth noting that the AI they started testing with Seekers and Drifters is now being deployed universally for all new NPCs, which means seasonal events until CCP gets to updating the anomaly and mission systems. Here's a presentation from 2015:
https://www.youtube.com/watch?v=7hC4I-9UxBoIt's not a crazy neural net thing, just a blackboard architecture. Still, the AI is actively being worked on, and it seems more modular than what they used to have.