The National Waterways Conference will hold its annual meeting in New Orleans at the Hilton Riverside Hotel on September 4-6 where some 350 business, civic and waterways leaders are expected to attend. Donald T. (Boysie) Bollinger, chairman and chief executive officer of Bollinger Shipyards, Inc., and Richard R. Calhoun, vice president of Cargill, Inc., and chairman of the National Grain and Feed Assn., will be the main speakers at the event. According to conference chairman, J. Ron Brinson of the Port of New Orleans, Bollinger of Lockport La., will address the opening luncheon. Bollinger Shipyards, one of the nation's largest builders of boats and barges, operates 20 shipyards from Mississippi to Texas. Calhoun, of Minneapolis, will speak at the closing luncheon.