NEWS: Finally, after years of online hoaxing over the date, the day on which Marty McFly arrives from the past via the time-traveling DeLorean automobile in the 1989 film Back to the Future Part II upon us — 21 October 2015:
In celebration of Marty's arrival from 1985, several events are scheduled to mark "Back to the Future Day" in the U.S. on Wednesday, October 21. That day will see the premier of Back in Time, a documentary on the making of the Back to the Future trilogy, in Los Angeles and on iTunes. Fans and enthusiasts plan to visit Southern California for a retro tour of locations where Back to the Future was filmed. The town of Reston, Virginia, will rename itself Hill Valley (after the film's fictional setting) for five days. The first Back to the Future comic book will be issued, explaining how Marty and Doc met. And some 1,700 theaters across the U.S. will host screenings of one or more of the trilogy's films.
Universal Pictures Home Entertainment has already launched a 30th anniversary Back to the Future: The Complete Adventures limited edition set on Blu-ray and DVD, and HarperCollins has published the book Back to the Future: The Ultimate Visual History, chronicling of the complete story of the making of these hugely popular movies.
As noted at the Hollywood Reporter, the Back to the Future trilogy will also be screened at theaters all over the world on "Back to the Future Day," including venues in Germany, Spain, the UK, Canada, Mexico, Russia, Australia, Brazil, Argentina, Colombia, and Chile.
Incidentally, the future of date of 21 October 2015 to which Marty travels supposedly does have some significance, having to do with a number of baseball predictions attributed to the film:
The reason [Marty] sets the DeLorean to Oct. 21, 2015? It's the day 30 years in the future when the Cubs are predicted to win the World Series. Bob Gale, who scripted the 1985 original with Robert Zemeckis, said that he tried to figure out when the final game of the Series would have played: “I did my homework as a baseball fan.”
Having been swept in the 2015 National League Champion Series by the Mets, the Cubs won't be appearing in the 2015 World Series, much less winning it.