The Fire Elemental meta-event in Metrica Province seems to be bugged on Dzagonur. The step “Destroy the Chaotic Materials” does not start, even though we cleared at least 7 of the events where you have to defeat a veteran in one of the chambers already. According to http://us.gw2stuff.com/en/events/dzagonur, the event is currently 3 hour 27 minutes past the end of the cooldown.
Edit: Now we are at a minimum of 8.
Edit 2: After pulling a moskito to Rooba, the chaotic material event started. Apparently he was somehow stuck underneath his golem all the time. This was likely the cause of the bug.