The fourth annual Ice Cream Social at the Waltham Public Library will be on Wednesday, July 11, at 6:30 PM on the library lawn. Hear trhe lively sounds of the Moody Street String Band free of charge. Four flavors of Lizzie's Ice Cream cups will be on sale for one dollar each. Guests are invited to bring lawn chairs and dancing shoes. A rain date is set for June 18th. Check waltham.lib.ma.us for updates.