JP side has thread talking about how bad this event idea is, it's interesting idea but not fun at all for those who can't participate specially for casual players that logs in for 2-3 hours a day. There is no announcement players just suddenly found out and unlike the other invasions this one spawns randomly within the 3 cities and even when it spawns has a limit for 16 players total so even if you been sitting there for 3-4 hours waiting if 2 groups jumps in right away you miss out. They are also saying if this is what YoshiP was saying about LIVE events of the 7th Umbral Era it's huge fail since not all will be able to experience it due to the limitations and YoshiP said if you continue to pay/subscribe you will be able to participate in these LIVE events.

Anyways as for me I got the Gridania one yesterday and sent me to Aqueducts, took a while for the event to start once you're in and number of mobs that spawns is bit low compared to other invasions. Anyone know if you get a special achievement for trying to get all 3?