Festival of Unmentionable Thoughts
Also known as
annually on December 12th
There is scant information as to what this holiday is about, apparently because whoever created it thought its details were unmentionable. Some people probably celebrate it, likely inside their own heads, without mentioning it. They probably think about taboo subjects and unmentionable thoughts.
How to Observe
We aren't going to mention any taboo subjects you could be thinking about today. Feel free to think about them yourself, but make sure not to mention them.