Special tournaments in Angry Birds Friends happen ever once in a while. They all have different themes, like video games or Angry Birds 2.
Video Game Tournament
Features: Video game themed levels.
This tournament featured levels themed with different video games, including Tetris.
Angry Birds 2 Tournament
Features: Silver cards, golden ducks, Chef Pig
This tournament marks the world wide release of Angry Birds 2.
Features: Kraken Pig
Revenge of Cyporkador
Features: Unlimited Wingman(Tournament only), Cyporkador
Features: Werepigs, Moon Orbs
This event celebrates Halloween 2015. Like previous Halloween tournaments, it has special pigs exclusive to that tournament. This tournament features Werepigs, which are a stronger version of minion pigs. When you hit a glass orb containing a model of the moon, the clouds part, showing the moon, and causing all pigs to turn into werepigs.