J.C.
That is exactly what I did for my girl's baptisms including the fruit and veggie trays but minus the crockpot food. I ordered all the food including the macaroni and potato salads. The place I used even provided mayo, oil, pickles and peppers too.
I had all the bowls /spoons out on my counter and when we came back to the house it only took minutes to transfer the food to the decorative dishes.