https://www.gamespot.com/articles/destiny-2-faction-rally-returns-soon-check-out-som/1100-6456067/

Back in December, Bungie had plans to launch Destiny 2's first Faction Rally event of Season 2 following Curse of Osiris's release. It ultimately canceled the event as the developer shifted courses on what content would be available to those with and without purchasing the DLC. Along with Iron Banner, Faction Rally will now be open to all players whether you own the DLC or not--and after the delay, the first Season 2 Faction Rally is nearly here.