September 25th is the 6th Annual Smithsonian magazine Museum Day. With a ticket printed from the site you get free admission to select museums throughout the United States. Clickhere to find a location in your area.
Locally, the Hjemkomst Center is a participating museum. There are other participating museums in the western part of North Dakota.
The Museum Day Ticket is only good for two people per household, per address. If you go to Museum Day with more than one guest, your other guests will have to pay full admission.
For tickets, you can download here.