After the event, sellers should file a special event sales tax return by the 20th of the month following the first day of the special event, if they have not remitted sales tax to the event organizer. For example, if an event was held from February 13-15, the special event sales tax return will be due on or before March 20th. More information about filing a return can be found on the "How to File a Special Event Return" section below.

Opera Colorado is Denver's premiere world-class opera company, presenting fine opera performances each season since 1981 at the city's Ellie Caulkins Opera House. The company mounts two full-scale opera performances each season in November and May, focusing on classics such as Verdi's La Traviata and Mozart's The Marriage of Figaro. An annual winter chamber performance is also presented, highlighting a new or contemporary opera work in a more intimate theater setting. Other performances throughout the year include recitals, panel discussions, and artist meet-and-greet events. Educational programming at the company reaches more than 45,000 participants each year, including in-school outreach programming. Opera guests can enjoy on-site dining at Kevin Taylor's at the Opera House, with bar drinks and snacks offered within the theater's lobby spaces before shows and during intermissions.
The forty-five mile trip takes four and a half hours to ride, as it is still coal-fired, and winds along narrow mountain paths and in and out of canyons. Historic narration is available on the trains for interested tourists. Both the Silverton and Durango ends of the line have railroad museums; the Durango Museum contains artifacts pertaining to the history of railroading, and the Silverton Museum displays a Baldwin Locomotive from 1902 in the original 1882 Depot.

The natural grasslands beauty can be a refreshing contrast to the beauty found at mountains or beaches. Explore the area and the prehistoric drawings, or head out to the Picketwire Canyon to see dinosaur tracks! Hit the trails on foot or bicycle, or even on horseback. You can “rough it” at the local campground or head back to a hotel to put your feet up.
You don’t have to love tea to enjoy a tour of Celestial Seasonings. Its headquarters, just outside Boulder, not only provides a behind-the-scenes look at how tea is made but also has some unique attractions that are a whole lot of fun. Take a whiff inside the Mint Room and see how long you can stand it. Spend some time in the tea shop or enjoy a casual outing at the Celestial Café. It also has an art gallery and a herb garden.
The Buffalo Bill Museum and Grave, about 6mi (10km) outside the center of Golden, pays tribute to Wild West legend Buffalo Bill Cody. It sheds light on his life and Wild West shows and contains artefacts such as Sitting Bull’s bow and arrows, show outfits and other objects from the Old West. The gravesite and museum sit in Lookout Mountain Park, overlooking the natural beauty of the Great Plains and the Rockies. You may even catch sight of the herd of buffalo and other wildlife that live in the area.

Mesa Verde has been inhabited since 7500 BC by nomadic tribes, and the experts estimate that the first pueblos were built in 650 AD. The impressive cliff dwellings that still bring visitors to the park were built in 1200 AD. See the Cliff Palace and spend some time learning about these native americans at the Chapin Mesa Archeological Museum. Don’t forget to explore the Mesa Top Loop Road for some excellent viewpoints and canyon overlooks.
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