An example of event [or event chain, as ArenaNet describes it] might be: You suddenly notice a dragon flying overhead. Any player in the area may choose either to help drive away the dragon or to ignore it altogether. If the dragon is successfully driven off, anyone who participated in its defeat receives a reward. If its not defeated, it swoops down and destroys a bridge. Nearby bandits begin attacking the workers, and nearby players who successfully defend them from bandits receive a reward. AreaNet cites this example as a "Very simple event chain -"
Author: Kristen Salvatore PCGamer may 2007 edition