We reached our 60th wedding anniversary on October 3, 2013. We decided to celebrate it during the Christmas holiday when it might be possible to get our entire extended family together. Everyone was very cooperative. Although they arrived and left at various times, there were two days when all 19 of us were there at once.
We took that opportunity to have a professional photographer come to the house and take pictures of us in various groupings, whatever anyone requested. Coincidentally, we wound up with 19 groupings as well as 19 people.