Dinosaur Ridge in Morrison (always free)
This park in Morrison, Colorado (southwest of Golden) is really an outdoor museum, where you can hike or ride a shuttle as you examine evidence of Dinosaur activity in Colorado. One of the popular Colorado attractions for kids.
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.
Community Car Show and Drag Race
The annual Community Car Show in Littleton takes place Saturday September 12th, 2015, from 10am to 2pm. Admission is free both for spectators and exhibitors. The car show takes place at Heritage United Methodist Church and will include music, free snacks, and you will vote on the People's Choice winner.
After the car show, a drag race takes place from 4pm - 8pm at Bandimere Speedway in Morrison. Admission is free for spectators, and $30 for racers.
You are encouraged to bring a canned food item or good condition used winter coat or boots.
When:
Saturday September 12, 2015
Car show runs from 10am to 2pm.
Drag race runs from 4pm to 8pm.
Where:
Car show takes place at Heritage United Methodist Church:
7077 S. Simms Street
Littleton, CO 80127
(next to Chatfield Sr. High)
Drag Race takes place at Bandimere Speedway in Morrison:
Immediately off the C-470 Morrison exit.
Pueblo Chile Festival
The Pueblo Chile & Frijoles Festival in Southeast Colorado is guaranteed to burn your eyes with fun! Besides being overcome with tears in the chili roasting area, you will find a diverse selection of music and dance performances as well as local vendors.
Denver Cinco De Mayo Festival (May 3-4, 2014)
One of the best ways to experience Denver's rich Hispanic heritage is to visit the annual free Denver Cinco De Mayo Festival, one of the best things to do in Denver on a May weekend.
Golden Buffalo Bill Days (late July)
Golden hosts an annual festival celebrating the life and spirit of Buffalo Bill, who is believed to be buried at the top of Lookout Mountain. If you're in the front range during the last weekend of July, Buffalo Bill Days is one of the best things to do on a warm summer weekend.
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: 
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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.
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.
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:
Children's Museum of Denver Free Days (first Tuesday monthly, 4-8pm)
One of the best free Denver attractions for kids, the Children's Museum of Denver's free day takes place from 4pm to 8pm on the first Tuesday of every month, known as Target Tuesdays.
Olympic Training Center Tours in Colorado Springs (always free)
The United States Olympic Training Center in Colorado Springs is the home of a huge Olympic visitor's center, the U.S. Olympic Hall of Fame, and serves as the training center for many of our country's top athletes. A free tour of the Olympic Complex is one of the best things to do in Colorado Springs.
The Littleton History Museum (always free)
The Littleton Museum is a 14 acre indoor and outdoor history museum depicting Colorado pioneer history. Two historic farm sites featuring a schoolhouse and blacksmith shop bring history to life in a way that consistently rates this museum as one of the top living history museums in the United States.
Euclid Hall Denver Happy Hour (Downtown Denver)
OK, I normally make it a policy to only check out Denver happy hours that have food specials with drink specials. However, when I saw that that 5280 had deemed Euclid Hall the best Denver happy hour, I had to check it out for myself. I went in skeptical, and came out satisfied and stuffed.