Iowa Events DU events are fun! More importantly, the revenue generated from these events is critical to our conservation mission and the future of waterfowl hunting. Story County Dinner-Ames Friday, April 26, 2019 Big Marsh Sporting Clay Shoot Saturday, April 27, 2019 South East Greenwing Day Saturday, May 11, 2019 Big Sioux Dinner Saturday, June 1, 2019