There is a block of rooms at the Marriott on the “travel” page. There are also various air b&b’s and VRBO’s around the area.
Downtown Denver is very close to Brighton (about 20 minutes). There are many restaurants and things to do around that area. The Rockies are home that weekend!
If you are flying, fly into Denver International Airport. Brighton (the wedding location) is about 20 minutes (~19 miles) from the airport. There is no shuttle service from the airport, so renting a car at the airport or using Uber/Lyft is a good way to get around.