The event would be pretty simple.
"Guardian. Planetary data sources show major front pushes occurring. We have never seen a push quite like this. Let's get down there."
Loading up a given planet like we did in the beta with the moon suddenly being accessible? Will show a new patrol icon with a death skull. The enemies are all upgra dedicated with multiple squads contesting land masses. No area would be a safe zone so to speak.
Bounties given by the vanguard will include daily and weekly ones.
As for the crucible side? After completing the patrol element? Guardians would be called for two additional quests. The first would push them into strikes with added difficulty modifiers and the second would be a ring match of all major gametypes like control, rift, clash, and skirmish.
Additionally for trials players... In that event? Trials would look to increase guardian rewards for successful challenges to the gold tier system. These would not be your normal Bounties and would ideally encourage multiple passage difficulties...
Change anything? Want this to happen? Let's hear it...