Both events begin on Monday at 10am PST (5pm UK time) and end at the same time on October 31.
The Black Ops 2 event was officially announced on Treyarch's Twitter account, whereas the Ghosts one was tweeted by Infinity Ward at exactly the same time.
This is possibly the final major promotion for both games before the release of Call of Duty: Advanced Warfare, which is set for release imminently.
The Call of Duty Advanced Warfare release date is November 4 on PC, Xbox 360, Xbox One, PS3 and PS4.
Activision has announced that customers who purchase the game digitally on Xbox 360 or PS3 will be able to download the new-gen version within the same console family free of charge.
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