There are many ways to have an elegant picnic. Here are two.
If you are Grace Kelly:
You drive to a lookout point in the South of France in a convertible and nibble on fried chicken. You drink cold beer, pouring it in a small glass. Your companion is Cary Grant. See To Catch A Thief.
If you are not Grace Kelly:
You unearth a big blanket and place it on the front lawn. You eat good sandwiches and Rainier cherries with your children and spouse and unsuccessfully look for clouds in the sky.