https://www.gamespot.com/articles/destiny-2-iron-banner-gear-rewards-whats-new-and-h/1100-6453830/

The next big event in Destiny 2 is just around the corner. Bungie has confirmed that the game's limited-time Iron Banner Crucible event returns on October 10, making its first appearance in the sequel. While the name is the same, there's actually quite a bit that's changed from the previous game's version of Iron Banner. Below, we've outlined what's different, how to unlock Iron Banner access, and what kind of gear and rewards you can earn by taking part.

To participate in Iron Banner, you need to visit Lord Saladin in the Tower. That task itself requires that you complete the campaign, as the Tower is inaccessible until you've done so. Once you've spoken with Saladin, Iron Banner is entered through its own Crucible playlist, which features Quickplay modes and matchmaking. You can join with a Fireteam or dive in solo.