Decepticon Day
Decepticon Day was the name of a celebration made by humans in honor of the heroic Transformers, the Decepticons, for all the good they did for the people of Earth, such as protecting them from the evil Autobots.
No, you read that right.
Fiction
Big Looker coloring books
Megatron randomly declared to his troops that today was the Day of the Decepticons. The occasion was marked by the Decepticons going out to look for a factory to build an army of Decepticons. Decepticon Patrol
Generation 1 cartoon
After Shawn Berger revealed to the citizens of Central City incriminating footage that showed that the Decepticons were the "good guys" who were being exploited by vile Autobot propaganda, the in-progress Autobot Day was canceled and later re-worked into Decepticon Day.
A more martial affair than its Autobot counterpart, Decepticon Day involved a parade with the marching Decepticons in front of their adoring fans, led by Shawn Berger. Megatron's Master Plan, Part 2
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