The farmland surrounding Divinity's Reach is full of dynamic events. As you first walk down to the farms, you may have someone run over to you, begging you to help slay an invading Broodmother. In the opposite direction, you can help a farmer save his watermelons from a pack of ravenous rabbits. Participating (and completing) these events have consequences. In the instance of the rabbits, you can now buy and eat the watermelons for a passive stat-buff, while the death of the Broodmother means the fisherman can now go back to work in the river. Some of these events lead into others, which can become a pretty long chain. You can stop whenever you want, of course, and other people can join in whenever they please. It was surprising how often some sort of event was within reach simply while running through the world.
Later, I logged into a higher level Charr character in a much more arid-looking locale. Again, wherever I seemed to go, there was something to do. One particular event chain ultimately led to the summoning of an enormous, purple, glowing dragon. My allies (as in, all the other players in the area) and I were rapidly killed by the beast as we got too close.