An event billed as the biggest farm show in the upper midwest is getting under way in West Fargo this week. The Big Iron farm show at the Red River Valley Fairgrounds runs Tuesday through Thursday. The expo is in its 34th year and will feature almost 700 exhibitors. It is expected to draw about 85,000 visitors. The North Dakota Trade Office says about 25 people from 15 countries are taking part in the Big Iron International Visitor's Program, which is aimed at helping agribusinesses expand sales abroad.