Yes, it's a real -- though very new -- thing, thanks to the Science Fiction & Fantasy Poetry Association, and officially proclaimed by the Governor of Minnesota. Find out more here:
https://specpo.wordpress.com/2017/11/02/november-3rd-is-international-speculative-poetry-day/ November 3rd was selected to honor the 60th anniversary of space dog Laika's historic mission aboard Sputnik 2. She was (thank you, Wikipedia) the first animal to orbit our planet -- and also the first Terran female in space:
https://en.wikipedia.org/wiki/Laika In honor of International Speculative Poetry Day, the SFPA has put up a special page of poems (and one lovely artwork) remembering Laika. One of them is mine.
https://specpo.wordpress.com/2017/11/03/2017-international-speculative-poetry-day-remembering-laika/ Please go read, enjoy, & remember.