We never really planned anything. We would just show up with a puzzle or some postcards, a few books or a favorite doll just to break the ice. They taught us how to play marbles, they were a great audience for my son's piano playing, and delighted in just watching the kids play.
Today we enjoyed the warm weather in the courtyard. The kids passed around a box of shells and then lined them up according to shape. It was a delightful morning! I would encourage you to try it.
The young with the old - It is a gift for all involved.