Rocky Mountain Arsenal Wildlife Refuge | always free
The free Rocky Mountain Arsenal Wildlife Refuge in Commerce City, Colorado (near Denver) is a beautiful and pristine National Wildlife Refuge, representing an impressive cleanup and conversion of a former weapons and rocket fuel processing facility. The views of the mountains from this perfect spot on the plains are quite impressive.
City Park Jazz
Looking for free Denver music? City Park in downtown Denver has a free summer jazz concert schedule with top performers.
Old Globeville Days and the Orthodox Food Festival (annually in July)
The Old Globeville Days Orthodox Food Festival celebrates Denver's international immigrant heritage with a diverse selection of free entertainment and international food. The music features outstanding performers of diverse folk heritage including an amazing Celtic performance. The incredible food selection is sample sized and you purchase tickets to try the samples. One of the best things to do in Denver on a warm mid-July weekend.
Golden Clear Creek Kayak festival (Wednesdays in June)
The "Golden Community Rodeo" is a weekly kayak competition in downtown Golden along Clear Creek at the Golden kayak park. You can sit or stand along the creek and watch the competition. It's pretty amazing what these kayakers can do, and definitely worth taking some time to watch. Can you think of a better thing to do on a warm spring Wednesday?
Competitors are arranged according to class. This year the classes are:
Juniors
Masters
Men: Sport, Intermediate, and Expert
Women: Sport, Intermediate, and Expert
Creek at the Peak Rafting Festival
The Creek at the Peak raft and kayak race takes place on June 23rd, 2012 and provides a great opportunity to watch rafters and kayakers compete for prizes while supporting a great cause. Come check out the race and the after race festival in Idaho Springs on Saturday June 23rd. The festival takes place on the east side of the Springs at the ball fields. The race finishes just west of Idaho Springs and begins in Lawson.
The festival begins at noon and will feature live music, food from local restaurants, and Idaho Springs' famous Tommyknocker beer!
When: Saturday June 23rd, 2012.
The festival begins around noon and continues through the evening.
The races begin at 5pm and will probably finish around 7:30pm.
Where: Idaho Springs at the ball fields on the east side of town.
For all the details, check the Creek at the Peak site: 
Evergreen Chamber Orchestra (Saturday February 2)
The Evergreen Chamber Orchestra will have a free performance on Saturday Feb. 2, 2013, 7pm at Evergreen High School. Talented students from area schools will participate with the Evergreen Orchestra in this free concert.
The Evergreen Chamber Orchestra Web Site:
http://www.evergreenchamberorch.org/
Two Ponds National Wildlife Refuge, Arvada (always free)
Two Ponds is a very small National Wildlife Refuge which was created as a place for migrating birds to stop and rest.
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Boulder History Museum (free first Sunday monthly)
The Boulder History Museum offers free admission on the first Sunday of every month. This is a great deal and a chance for the rest of us to check out the museum's permanent displays, changing exhibits, and kids activities.
Winter Trails Day (annually, in January)
Winter Trails Day is a nationwide event, with free or discounted access to many cross country (nordic) ski trails and snowshoe trails, free tours, free rentals, and that sort of thing.
Leanin' Tree Museum, Boulder (always free)
Over the years Ed Trumble has assembled what is likely one of the finest collections of western art in America. His collection is housed in the Leanin' Tree Museum and Sculpture Garden of Western Art in Boulder, Colorado.
The free Leanin' Tree Art Museum is one of the best museum values in Colorado. The exhibits are truly amazing and represent many decades and styles of western American art. The museum contains over 250 paintings and 150 sculptures.
Hours:
Monday - Friday 8am to 5 pm.
Saturday, Sunday, Holidays 10am to 5pm.
Closed Easter, July 4, Christmas Day, New Years Day.
Location:
6055 Longbow Drive, Boulder Colorado, 80301.
Located near the free Celestial Seasonings Tour.
Check the Leanin' Tree Museum site for the latest info:
Denver Restaurant Week 2016 (Feb 26 - March 6)
For 2016, Denver will be celebrating Restaurant Week in February and March. Denver Restaurant Week features top downtown restaurants for a reduced price.
Santa Fe Art Walk (first Friday monthly)
Denver's Art District on Santa Fe Drive features one of the more diverse collections of galleries in the United States, all situated within a short walking distance.
Irish Snug Denver Happy Hour (Capitol Hill)
Happy hour at the Irish Snug just south of Denver offers cheap, quality food and more than affordable drinks. Their happy hour menu is offered every day from 3-7 and 10-12. A diner will encounter traditional Irish fare, such as corned beef sliders and sangers. If you don’t like Irish food, don’t worry. The Irish Snug also offers burgers, tex mex and sophisticated American bar food.
University of Colorado Museum of Natural History at Boulder (always free)
The University of Colorado Museum of Natural History is a free natural history museum on the CU Boulder campus. They have excellent changing exhibits, a dinosaur section, and an extensive bird display. A small donation is requested to help keep the museum open and free. This is a fun small natural history museum for adults and curious kids.
When:
Monday - Friday 9am - 5pm
Saturday 9am - 4pm
Sunday 10am - 4pm
Where:
The Henderson Building on the CU-Boulder campus, between 15th and 16th streets east of Broadway.
For details check their web site: