I'm not sure how I missed this, but if I did, someone else might have done so as well.
On 2015 October 21 I was on a flight and saw another passenger with a copy of USA Today with the same front page depicted in Back to the Future 2. It took me a bit to figure out that this was the date Doc Brown and Marty McFly had traveled to in that film, hence the commemorative issue. (I picked up my own copy but I've no idea what I did with it.)
Anyway, today quite by accident I ran across the following clip from Jimmy Kimmel Live that aired that same night. Christopher Lloyd and Michael J Fox reprised their roles along with some surprises.
Link: https://youtu.be/Q0VGRlEJewA by