Monday, September 22, 2014
The American Tolkien Society first proclaimed Hobbit Day and Tolkien Week in 1978, and defines them as this: "Tolkien Week is observed as the calendar week containing September 22, which is always observed as Hobbit Day", but acknowledges that Hobbit Day pre-dates their designation.
Due to the discrepancies between the Shire Calendar and the Gregorian Calendar there is some debate as to when to celebrate Hobbit Day, since the actual birthday would be between September 12 and 14 on our calendar.
(Yawn ... I'm boring myself!)
I'm not sure what you're supposed to do to celebrate, but for all you sci-fi aficionado's out there... Happy Hobbit Day!