Fort Robinson has wonderful cabins that the wedding party and close family will be staying at. You are more than welcome to book a cabin or campsite at this link: https://outdoornebraska.gov/location/fort-robinson/
If you would like to sleep the more traditional way there are hotels in Chadron, NE, which is about 30 minutes away. As of right now we do not have a block in any of the hotels but if you are interest please reach out so we are able to set one up! :)
-Chadron Inn