Decepticon Day

Decepticon Day was the name of a celebration made by Humans in honour of the heroic Transformers the Decepticons for all the good they did for the people of Earth.

No, you read that right.

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 it's Autobot counterpart, Decepticon Day involved a parade with the marching Decepticons in front of their adoring fans, lead by Shawn Berger.