Chained events - otherwise known as dynamic event chains - are something I have read about and "sort of" experienced through the BWEs 1 to 3.
It was actually only during the stress test last night that I began to realize how GW2 was changing my mindset when playing MMOs, in a very fundamental way, and that chaining events aren't always in-your-face obvious.
A little bit of background on the event:
It was in the Asura zone, and I was running around until I came upon a lab being attacked by nasty inquest members. The battle proceeded as expected, with loads of people joining in until all the waves were defeated and the event ended.
At this point, I had no event active, so I thought, based on my assumption-based mindset (derived from playing MMO's), "Well that was fun, let me run to another place and see if I can come across another event."
As I was heading out, I stopped to listen to a golem talking about how his protocol was corrected, and he should get going on his search path. I thought that was quite cute. At this point, I broke from my mindset of "Oh, that's just scripted and the Golem will probably head off walking and then despawn because it's just a bit of fluff with no meaning like every other MMO". Breaking from that mindset, I chilled into the game and just ended up following the Golem on his little walk.
It was here that my mindset, and approach to GW2 were changed fundamentally.
The golem didn't despawn. He didn't disappear. He didn't just stop and repeat some scripted speech.
He actually carried on walking, and ended up at another laboratory, where his search protocol gave him feedback... and he identified more undercover inquest members!
BOOM! Another event kicked off!
The reason why I found this to be so fundamentally changing is because there was no reason telling me to follow the Golem - it was an organic interaction and reaction to what was happening in the world. There was no quest text on screen telling me to "Follow Golem!" or any indication whatsoever that this Golem would lead me to another event. And it was amazing that instead of being guided by quest text, I was actually now playing the game and being guided by the game itself.
TL;DR:
Assumed Mindset before this event:
1) The only thing to do in an MMO is when a quest tells you to do something.
2) Quest NPC's despawn and disappear into a void of meaninglessness when the quest script ends, so don't bother "engaging" these after the quest is done.
New mindset after the event:
1) Engage the WORLD, not the quest! Don't just run around looking for event quests to pop up on screen to tell you to do something, because they aren't all active - be aware that NPC's and other things in the world itself could give an indication or warning or notice of upcoming events.
2) Again, engage the WORLD. Listen to NPC's. Follow them. Treat them like other real players, and you are likely to be rewarded with "organically occurring" chains.
It's a big change. And I hope GW2 players, new and old, understand to engage the world through sight, sound and NPCs instead of just quest text or event markers on the map.
EDIT: Formatting. EDIT2: Thanks Horotho for the mob names (inquest).
EDIT3: Do you guys think there should be a "how to play GW2" type guide giving ex-standard-mmo players advice or guidance on how GW2 actually works in terms of "questing" and interacting with the game beyond quest text?