Cocktail attire. The ceremony and cocktail hour will be on grass, so ladies - heels are not recommended! It is also September in CO and the weather can be very unpredictable so jackets/coats are advised in case the temperature drops!
If your invitation says "and guest" then yes, you can bring a date.
Kids are invited to the welcome party the night before, but unfortunately no kids are allowed at the ceremony/reception.
Yes, we will have a shuttle bus leaving from the Marriott Boulder. It will only be making one trip up and one trip back, so if you plan on leaving early then it is advised that you take your own car.