L.C.
You could do cupcakes with pig faces, cow faces, chick faces and so on.
Or you could make several round cakes with the faces on them.
Make vests out of paper grocery sacks. Cut down the middle of one side and then cut a neck hole out of the top and arm holes out of the sides and let them decorate.
Cut out a rough shape of a sheep and let them glue cotton balls on and glue a blck button for the eye and paint or color the lower legs and hooves black.
Play Duck, Duck, Goose. Play Pin the Tail on the Donkey. Do a Barnyard version of an eater egg hunt, just call it a Chicken Egg Hunt. Just hardboil the eggs and don't color them.