Niantic has announced, “starting November 23rd at 00:00 UTC and going through November 30th 00:00 UTC, we will double the amount of XP and Stardust you receive when completing in-game actions.” This is really only about a week long benefit, but double XP will be clutch in helping many trainers chip away at that the long and tedious grind to level 40. The double stardust will have a much bigger immediate impact for trainers. Since stardust is needed to power up any Pokemon, it is essentially the most valuable item in the game. Getting a full week of double stardust could help trainers to power up a couple of their best Pokemon, which they could then use to beat up some local gyms.
Pokemon Go’s Halloween event was a success so it makes sense that Niantic will keep making different kinds of events. Maybe in a couple years, when more Pokemon have been released, Niantic could have some type of Thanksgiving event where trainers will only find various bird type Pokemon for a day. For now, make sure to get out and take advantage of those double bonuses.