Season of Arrivals has begun in Destiny 2, and one of the first things you will need to do is a quest for the Drifter. Season of Arrivals contains new Engrams called Umbral Engrams, and you will need to jump through some hoops to be able to open them.
The Drifter will ask you to take the Seed of Silver Wings, an item you got from Eris Morn in the previous mission, and complete the contact Public event.
As far as we can tell, you do not need to be successful in this, you just need to complete it.
This public event is currently available on Io, as you can see in the image above. Just spawn in and Lost Oasis and then make your way there. Contact is a tough public event and plays out a little bit like Gambit. You need to kill enemies and collect the motes they drop, then deposit these in the bank.
Each full charge will spawn a wave of powerful enemies that you must defeat to move on to the next wave. This is a race against the clock, and if you get to the final part, you will need to fight a boss to finish the event. Successfully finishing it will net you another Umbral Engram, and you will then need to return to the Drifter to find out the next step.
We would suggest a crowd clearing focused build for this event, so you can rapidly rip through the large numbers of enemies that will be spawning in and gunning for your head.