Flight
Recommend renting a car. The wedding venue is more rural.
Hotel
These will be most urban areas to stay, about 45-60 min from the venue. In Denver recommend North Denver such as RiNO, LoHi or Downtown
Hotel
Closest to venue would be Loveland, CO (not to be confused with ski resort Loveland which is in Dillon, CO) and Longmont, CO
Hotel