It has come to my attention that the frequency of DEs has reduced because the population has spread out and everyone isn’t going around talking to NPCs.
Apparently, many if not all DEs are triggered by talking to an NPC.
This stinks of old fashioned talk to X NPC to get quest, only in other MMOs there is usually a big sign above their head and often on the map to lead you to them.
I suggest that there should be a random timer that sets off events at a fairly decent interval as long as there is at least one player nearby.