Cross map events
This might be more suited for the suggestions section. Just to add. Though not a true cross map event, a contested temple of name your god in any zone in Orr, makes all statues of that god in all zones of Orr corupted.
Arise, opressed of Tyria!
The Flame & Frost “event/story” takes place in two different maps, although it isn’t really a dynamic event BUT it could possibly be a test to find out if such “cross-map” events could work? Ah, dreams…
I suggested this a long time ago, but the problem with this idea is that the zones are not synchronized with each other on the same server. They are essentially isolated from each other which is why it can be day in one and night in the next. Then there’s the issue of overflow servers.
The example I used was a pirate ship landing off the coast and a world boss pirate and his crew wander around zones looking for treasure and causing general havoc and the events would be to slowly push him back onto his ship for a final boss battle.