House Or Rental
Generally speaking, AirBnB is your best bet for finding good options to stay for a reasonable price. The ceremony/reception are in Thornton but anywhere nearby neighborhood should work just fine. It's also 20 minutes from Downtown Denver and 30 to the airport.
Rental Car
Colorado isn't the most public transportation friendly state, outside of Denver, so if you're flying in, we'd recommend renting a car to get yourself around.
Hotel
If hotels are more your thing, there is a Hilton about 10 minutes from the venue