On 1st April, 1977, Richard Booth declared Hay to be an independent Kingdom, with himself as King.
Which is something worth celebrating on the 40th Anniversary!
So events are planned over the weekend of 31st March to 3rd April.
On the Friday night there will be a reception at Booths Bookshop, to which all the book sellers in town have been invited.
The Old Electric Shop will be doing literary cocktails.
Deborah Moggach will be the castaway in the Globe's version of Desert Island Discs on the Friday evening. The Globe will also be hosting a panel discussion on the Saturday afternoon for booklovers, and a booksellers' brunch buffet on Sunday morning.
The children of Hay School will be having a fancy dress parade, dressed as their favourite book characters.
The original Hay flag will be hoisted in the Honesty Gardens in front of Hay Castle, and knighthoods will be given out (it is hoped King Richard will be able to attend).
A book art co-operative will be displaying their work in book shop windows around town.
And on Instagram, the organisers want to make this the largest bookstagram meet-up ever.
They also hope to make this an annual affair.
Let's celebrate Hay-on-Wye and second hand books!