In the early US cities,,, families would picnic on their plots... because sometimes it was the only green space that they had, and then they put up little fences. I learned that on numerous tours of historic cemetaries. ...I used to have pictures but have no idea where they are.
Here is an article about picnics in cemeteries:

http://atlanta.about.com/cs/historic...ndcemetery.htm

or one where you used to have to have a ticket to get in ...http://www.wbur.org/special/foresthills/