https://wiki.guildwars2.com/wiki/Cathedral_of_Zephyrs_
This event is setup such that it requires a fail state of the defend Zephyrs event in order for the main chain to start up that actually completes the quest. This is not well matched with the hint for Dawn which says “Cleanse the Cathedral of Zephyrs in Malchor’s Leap and loot this from the chest.”
I showed up there last night and there were 8 people sitting at Zephyrs and a bunch of other people waiting around for the main event to start. The people up at Zephyrs kept defending the temple not knowing that is was not what’s needed for the precursor quest.