It was an event where one user can change the color of a single pixel at a time, choosing from a predefined color palette. There was a cooldown on how often you were allowed to color a pixel, 5 minutes or something, I don't remember.

It was a fun way for communities to band together and draw pixel art over the course of a week or so. It was fun the first time because it was spontaneous and there weren't very many bots, if any. After that, it was just a competition of who paid for the most bot accounts so they could camp a space to keep a clear picture. Completely lost its draw IMO (no pun intended).