I didn't know about doughnut day, but I have to tell you all what DH did to the grands.

He had a handful of Cherrios on the counter, when the boys came over he told them they were doughnut seeds. Took them out in the yard and "planted" them. Told them the seed would grow into a tree by the next time they came over. Weeks passed, the kids were coming. DH gets a tree branch stuck in the ground, and hangs some doughnuts on it.
Well!!!! That was a hit!!!!! DH and the boys did it again, and again we had a doughnut tree in our yard. The oldest now wants to plant some chocolate doughnut seeds. He's 7 today.

Hope you all had a laugh