A Whollyday occurring on 10 Chaos aka 10 January aka 10 01. Backwards Day also occurs on 10 Chaos aka 10 January, but is a different holyday.
Celebration[]
For those who recognize January 26 as Backwards Day. It’s basically the same holiday, but focuses more on the bi part.
Text from Principia Harmonia and Ek-sen-trik-kuh Discordia: The Tales of Shamlicht.