https://www.gamespot.com/articles/destiny-2-faction-rallies-end-today-on-ps4-and-xbo/1100-6453714/

One of Destiny 2's first major limited-time events, Faction Rallies, is nearly over. Although they will return again in the future, today marks the final day of this particular instance--and, thus, your last opportunity to earn Faction Rally rewards.