I was thinking of a special public event that could be released anytime this year (perhaps New Years Eve) where for a weekend, the Tower is under attack from the Vex, Cabal ect. It should happen randomly when you have a fireteam of 4 and you're walking through the Tower getting bounties then when someone tries to go to Xur he could deliver a message to the would be customer about the Vex, Cable, Fallen ect initiating a deadly attack. One bounty should be available and wave after waves of enemies attack and the key to success is to protect the underground part of the tower where the guardians will be located? Once completed you should be awarded with a exotic engram (depending on xp earned, precision kills, total kills) and with ascendant shards and special emblens and a shader. Feel free to add to this thread of your ideas