Could this be the May Undead Thread?
What is “May Undead?” What may they (the undead) do?
In 2006, they did this. And ...
In 2007, they did this. And ...
In 2008, they did this. And ...
In 2009, they did this. And ...
In 2010, they did this. And ...
In 2011, they did this.
So actually, no one knows.
The Undead are largely unconstrained, except by the bonds of amity. The Undead Thread is a peripatetic social event, to which all are invited. There are rules, which can be summarized as “Be fun, or sad, or completely off your rocker, but don’t be obnoxious.”