Okay we're on our way

This morning I made our reservation for the Phelps Grove Park pavilion for June 16, 2012.  We have it reserved for all day so folks can come and go as necessary but my thoughts are that the main activity will be around a lunch time picnic.  Others can chime in with any suggested activities for the day and one decision that needs to be made is how to handle the lunch.  Do we arrange for a catered picnic?  Do we just let each family bring their own?  Please comment with suggestions.