Decepticon Day

Probably not a member of S.T.A.R.S. I'm guessing...

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.

Fiction

Generation 1 cartoon

Ringmaster or Clown: you decide

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. Megatron's Master Plan, Part 2

From Teletraan I: The Transformers Wiki, a Wikia wiki.