Yeah that would be amazing. Rift is doing that through "Zone Events". A message is broadcast to all players in the chat to say "Zone event [name] have started in the area [area_name]", so everyone can be informed and head there. It is also possible to check the status on your map. Like Besieged somewhat.
And even better now, with the mobile application, you can even be notified of zone event without being logged in![]()