Yesterday i participated in the event to free the temple of Balthazar (starting at Pact Rally Point).
Most of the entire event i saw no player characters, no mobs, no npcs, only visual effects of the fighting, and about 5 commander tags floating in the air. Only a few times i could actually tag/hit a mob.
Things started to show up only minutes after the event was over, i estimate about 20 players took part in the event.