Sunnyside Music Festival (mid-September)
The free Sunnyside Music Festival is a showcase of Colorado talent that takes place each year in Denver's Sunnyside neighborhood.
Colorado Dragon Boat Festival (end of July)
Held annually at the end of July, the Colorado Dragon Boat Festival is a colorful and tradition-filled celebration of Asian culture. The adult and youth boat racing competitions have grown every year and are an amazing event to watch. The performing arts stages feature the talent of Asian dance and music performances as well as martial arts exhibitions. A colorful and amazing festival and a great thing to do on a summer Denver weekend.
Don't miss the 2016 Colorado Dragon Boat Festival!
A Taste of Colorado (Labor Day Weekend)
A Taste of Colorado is Colorado's largest Labor Day Weekend festival. This festival highlights diverse cuisine from Colorado restaurants, offering bite size tastes to full meals.
Colorado Free Fishing Weekend (First Weekend in June)
On the first weekend of June each year, Colorado waives fishing license requirements. This is a great chance to grab your gear out of storage and take the family to a nearby lake or stream for some serious trout fishing!
Punkin Chunkin Colorado | Aurora Jack-O-Launch (annually, 2nd Saturday in October)
This October festival has become a Denver tradition.
Morrison Nature Center at Star K Ranch, Aurora (always free)
The beautiful Morrison Nature Center is a free park in Aurora, Colorado that is definitely worth checking out when you are in the area.
Snowmass Summer Concerts
On summer Thursdays and Fridays the laid back atmosphere of Snowmass Colorado comes alive with their free Snowmass Village Summer Concerts. The music, set up on a Snowmass ski run stage near the upper village, is loud and wild.
When:
Summer Thursdays (and sometimes Fridays) from 6:15 to 8:30pm.
Where:
Snowmass upper village.
Schedule:
The 2013 Snowmass Village Free Summer Concert schedule is as follows:
June 20: Freddy Jones
June 27: The Dunwells
Friday July 5: CJ Chenier
July 11: The Revivalists
July 18: Mountain Standard Time
July 25: J.Boog
August 1: Tab Benoit
August 8: Nigel Hall
August 15: Robert Walters
More Info from the Aspen Snowmass web site: 
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McCormicks Fish House and Bar (Downtown Denver)
I am a sucker for old buildings, and McCormicks Fish House and Bar, located in LoDo in downtown Denver, has everything I'm looking for.
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.
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.
Willie G's Denver Happy Hour (Downtown Denver)
Willie G's is a great place to have a happy hour snack and a cocktail in the middle of the 16th Street Mall in downtown Denver. The street facing patio allows diners to relax with a drink and watch Denver tourists and businesspeople pass by.
Monarch Mountain Free Day (April)
For 2013, Monarch Mountain is offering a free lift ticket in April if you purchase a $10 GEMS card.
Get the details and order your GEMS card here:
Location:
Monarch Mountain is located in South Central Colorado near Salida. Map
Learn more about Monarch Mountain Ski and Snowboard Area at their web site:
Hammonds Candy Tour (always free)
Hammond's Candies in Denver has been producing high quality hard candy and chocolates since 1920. The Hammonds Candy Tour shows you the process of creating and packaging Hammonds candy. After you enter the tour center and receive your tour sticker, free Hammonds candy samples are provided and you can take a hat if you like as well. You can browse the OOPS! room where Hammonds candy mistakes can be purchased for low prices.
The tour begins by watching a short movie describing the Hammond's Candies company, it's history, and the candy making process. You then enter the production viewing area where you watch the workers create candy from start to finish. You then move to the packaging area and finish with another free sample to take home before you enter the store and gift shop.
Hammonds Candy Tour Hours:
Monday - Friday 9am - 3pm
Saturday: 10am - 3pm
Closed Sunday.
Where:
5735 N. Washington Street, Denver, Colorado.
58th Street between Washington Street and I-25.
For more information visit the
Hammonds candy tour 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.