The Iowa Arboretum is 415 acres of trails, prairie, woodlands, and, most importantly for the Convention, four separate gardens hosting over 400 guest bearded irises. The Arboretum showcases hundreds of trees, shrubs, and flowering plants. Of special iris interest is a collection of Siberian iris Morgan-Wood Medal winners (preceding link is to the Iris Encyclopedia Morgan-Wood Medal page with history and photos). There are also both bearded and beardless irises in other plantings on the grounds.
American Iris Society 2017 Convention 