Those planning to fly in for the wedding should fly into the Missoula airport. You should also plan on renting a vehicle for traveling to Carl's parent's property in Arlee where the rehearsal dinner and wedding will be held.
There will be no on-site room accommodations, but camping on the property is HIGHLY encouraged. For those looking to sleep in a bed, we would recommend trying to book an Air BnB in Arlee or the surrounding area. Ninepipes Lodge is also rumored to be a nice place to stay though it is a little further from the property. The closest hotels to the property are probably in Missoula near the airport.
There is plenty of room for people to spread out camping. We also have several outbuildings on the property where some people can sleep under a roof if desired. Make sure to bring your own tent/sleeping bag/gear if you decide to camp.