PICNIC AT CEDAR LAKE.The butcher and his family, and the butcher’s boy and his best girl, and the groceryman and his family and his maid servant and his man servant, all cirt out work in Chicago yesterday and held two big picnics. Practically all the grocery stores and meat markets in the city were closed during the entire day, and because lots of people had neglected to law in stocks of supplies, the delicatessen stores had an exceptional run of business.The Chicago Grocers and Butchers’association spent the day at Elliott’spark, while the North Side Retail Grocers and Butchers’ association celebrated at Monon park, Cedar Lake.