Are you planning to stay in a Colorado State campground? Most do not have full hook-ups but include electrical, water and showers. A dump site is usually located at a remote edge of the campgound. Campgrounds that are convenient to the Arts Festival include Chatfield and Cherry Creek. They are about twenty minutes away from the Arts Festival. Boyd Lake is about an hour plus drive to the north of Denver. Both Chatfield and Cherry Creek have full hook-up which includes dumps at most sites.
You can get information at
http://parks.state.co.us. Reservations can be made six months in advance and are a must as people the campgrounds will fill up quickly. Local campers know the best sites and they compete for them by being the first to reserve. Cherry Creek while being the nearest to your destination does not have many sites, expecially full hook ups. You can usually drop in to camp without difficulty during the week. But the full hook-ups (include dump on site now) are reserved early.
If you would like to stay in a privately owned campground, you will find Dakota Ridge to be extra nice and clean and with full hook-ups. Dakota ridge is located about 1/2+ hour to the west of Denver and near Golden. Sixth avenue would give you a straight shot from Dakota Ridge to the Festival.
There are many campgrounds in Estes Park. Elk Meadows is highly recommended. Travel distance to the Arts Festival may be 1 1/2 to 2 hours.
Have fun and plan to stay a while. Maybe we can get together for a little camping. Anyone else care to camp?
Hal