imperial event

I know a lot of people have done the imperial fights with the H-1 and the 6 elites around the world. I accidentally ran into the event once and I haven't seen it since. I've been trying to find it and I'm spending alot of anima since atomos isn't happening lately with numbers. Does anyone know specifics with this event like pop times and exact locations. Thanks all.

Where does it occur?
Iron Lake, Broken Water, Crimson Bark, Dragonhead. If it's up in one zone, it's up in all four zones, so stop wasting your anima.

How can I tell if they're up?
Turn on your music. Is this normal music for the area? They're not up. Is this strange battle-ish sounding music? They're up.

When does it pop?
Periodically. Just like all the rest of the Imperial events, they just... happen sometimes. They last for several hours, so there's that at least.

There's a guide out there somewhere, but I don't actually care about the event, so someone else can point you to it.

Thanks for the info. That will help a bunch :)