Let me start by saying that when I get an invite/save the date, I usually put it aside or hang it on the fridge but forget to put it on my calendar. I also sometimes forget to take it with me on the day of so that I can have the address and info of the wedding...and I always have a hard time finding people's wedding websites without the invitation on hand with the site written on it.
I know QRs are ugly, but I would love something that someone can scan and allow it to automatically populates their google or outlook calendar with the date, times, locations, and wedding website address. That way they dont have to worry about manually entering all the info, and on the day they do not need to drag the invite with them.
With that said....what are your thoughts on QR codes on the Save the Date or on an Invite Insert (not on the invitation itself)?