Back To The Future Day 2015 is celebrated on October 21, 2015, the day Doc Brown and Marty McFly visited at the end of the original Back to the Future and at the beginning of Back to the Future II.
Here are some developments from Back To The Future Day 2015.
Nike teased an announcement with Michael J. Fox:
Arx Pax released the Hendo 2 version of its hoverboard: