FYI. From Anon on the Chan.
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Mad Hatter Day 10/06/18
10/6
The date for the holiday was chosen because of how John Tenniel illustrated the Hatter in Alice in Wonderland. The English illustrator who was also a political cartoonist depicted the Hatter wearing a hat with a piece of paper that has 10/6 written on it. The 10/6 refers to the cost of a hat – 10 shillings and 6 pence. The creators of the holiday who are from the United States where the date is written in the month/day (mm/dd) format took this to set the date for the holiday on October 6 (10/6). For those who write the date in the day/ month (dd/mm) format, the holiday would fall on June 10.
How to Celebrate?
Read Alice in Wonderland.
Watch the movies based on the novel.
Wear a hat the whole day.
Host an Alice in Wonderland themed tea party.
Did You Know…
…that even though this holiday is called Mad Hatter Day and that the Hatter is also popularly known as the Mad Hatter, Lewis Carol never refers to the character as the Mad Hatter?
https://www.timeanddate.com/holidays/fun/mad-hatter-day