Starting Friday, August 8th, 2014, 10am PST both Call of Duty: Ghosts and Call of Duty: Black Ops II will be running double XP events.
Call of Duty: Ghosts will feature normal double XP as well as double XP in Extinction mode.
Call of Duty: Black Ops II will also feature normal double XP, as well as double weapon XP.
Each game will have a playlist added specially for the event. Call of Duty: Ghosts will have "24/7 Strikezone", while Call of Duty: Black Ops II will have "Nuketown 24/7".
Both events will end on Monday, August 11th, 2014, 10am PST.
For those outside the PST time zone, this may be helpful for pinpointing when the event starts in your time zone.
Note: In order to make room for Strikezone 24/7 Wargame - Recruit has been removed. Meaning only Wargame - Regular is avalible for those that play on Wargame. Also the XP cap is doubled meaning at least 8000 XP can be earned in a match.