What's the Kennection? #214

What Celtic language, brought by medieval immigrants to northern France, was declared "severely endangered" by UNESCO in 2007?

What name was used by the popes who gave us Europe's most popular forms of plainchant and calendar-keeping?

What former Klondike boom town has special permission to add the word "City" to its name, though it now has only 1,375 residents?

TV's 'Mystery Science Theater' is set in the "not-too-distant future," but the title name-checks what very-distant-future year?

Which 'Jack and the Beanstalk' character is called Blunderbore in some versions of the fairy tale?

What's the "Kennection"?