The number on the Mad Hatter's hat in John Tenniel's original illustration for Alice's Adventures in Wonderland is 10/6).
A Whollyday occurring on 60 Bureaucracy aka 6 October, or on 15 Confusion aka 10 June.
Celebration[]
A day for silliness celebrated almost exactly half a year from April Fools' Day (for those who celebrate on 6 October). Inspired by The Mad Hatter, a Discordian Saint, from the Discordian holybook Alice's Adventures in Wonderland. The Mad Hatter's hat in the original illustrations by John Tenniel has a sale sign saying "In this style 10/6."