Is there a picnic rug/blanket etiquette?
We were at park with a few other families and 2 families were quite keen that kids should not walk on picnic rugs with food on it.
I can understand that you don't want people treading in/over the food but it was almost as if rug should be regarded as dining table - place to have food on and which you would never walk on.
I'm a bit more relaxed and provided I don't get someone's toe dipped in my hummous I don't think the rug should be sacred.