We don't celebrate either of these days in New Zealand but I would have no objections to a Grandparents Day.
My mother is the senior grandparent in my family. She raised 12 children and has 28 grandchildren and 21 great-grandchildren. I hope I got that count right! Needless to say she has never learned to be idle. To this day her fingers are always busy.
To all the grandparents who are feeling a bit old and past their best, may your grandchildren be your pot of gold.
The shoot outs of the rest of the team can be found here.