That'd be cool. Like a broadcasting system
"Attention all guardians, heavy enemy forces moving towards Sector 4 on Venus. The Vanguard has requested all available units to proceed to the hot zone."
It'd be cool to incorporate this into these small drops of missions they're supposed to be giving us. Let the locations cycle randomly throughout the day and take us to new areas of the planets during these events. They would be quest markers that pop up on the corresponding planets.