What if while you were playing Destiny you heard an urgent message coming from the tower? Maybe it would be from your Vanguard Mentor, maybe even from our Beloved Cryptarch. This message might come through your headset like a dying whisper, or a panicked call to arms popping up like you've accepted a patrol mission. This message would be very clear, enemies approaching, defenses failing, we need you now, we need you [u]all[/u] now. I'm talking about the ultimate community event, team up now, or understand that all could be lost. Finish your pvp game, speed to the end of your pve mission, jump to orbit, and head home. The Fallen are breaking through, The Vex are massing their attack, The Cabal are making their final stand. The Tower will fall. Unless through their strength together, the Guardians stand to protect what is theirs. Snipers to the balcony, Titans to the front, it's going to be a wild ride. It will take 24 hours to get the Tower's defenses back online, you'll respawn in the special events area where the Tower's staff will be waiting, eager to provide their services if if means saving the last beacon of light from waves of enemies stronger than any one could defeat alone. Let's win this together.
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Massive scale combat probably is too much to ask for given network and hardware limitations. However, what about zone defense? A map of the city would be shown as a grid. You win or lose grids depending on individual fire team results. The story can start by having a massive attack penetrating the wall in several locations. You can set the panicked atmosphere by having citizens run by screaming, etc. Random matchmaking or fire teams can pick city blocks to "hold the line" until reinforcements can leapfrog your position to push back the fallen. The timer would count down until the next group of guardians can make it to the front lines. If you get wiped out, Guardians lose the block and must win it back. The closer to the Traveller the Fallen get, the more concentrated they are requiring high level people. Further out, low levels can help because the fallen are more spread out. The more outer grids won, will make the inner grids easier to defend, making lower level guardian contributions valuable. It could be a weekly event resulting in the Fallen "winning" and gaining a foothold in the city or the Guardians winning and pushing out Fallen. New missions can be given out to help gather materials to repair the wall.