The Boulder Creek Festival on Memorial Day Weekend
The Boulder Creek Festival takes place every Memorial Day weekend in Boulder along Boulder Creek, and features great free music, dancing, rides for the kids, and other entertainment. This is one of the best festivals of the year, and a great thing to do on Memorial Day weekend.
Colorado Mineral and Fossil Spring Show
The free Colorado Mineral and Fossil Spring Show brings gem and fossil dealers from across the U.S. to the Denver area to showcase their huge selection of amazing finds.
Up to 85 Retail / Wholesale Gem, Mineral, Fossil, Jewelry Dealers From All Over The USA
When:
April 14-16, 2017
Location:
The Crowne Plaza Dia
15500 EAST 40TH AVENUE, DENVER, CO 80239
http://www.rockygems.com/colorado-mineral--fossil-spring-show-2017.html
Wassail Days, Frisco | Dec 8-16, 2012
Frisco's annual Wassail Days celebrate the coming holiday season in typical Frisco style with a chili cookoff, free winter activities, and free cups of an Old English cider and spice mixture called Wassail. Local shops compete for your vote as the best Wassail in Frisco.
For 2012, Wassail Days takes place December 8th through 16th.
Some highlights of this week long event:
December 8th: Santa Dash for Cash annual run.
Tree lighting.
Chili Cook-off.
December 12th: Wassail night at Frisco's history park.
December 13th: Free Tubing at Frisco Adventure Park.
Free sleigh rides at Frisco Adventure Park.
Free Nordic skiing at Frisco Nordic Center! (I'll be at this one!)
Advance reservations are required for many of the events.
See the Wassail Days web site for reservation info: 
City Park Jazz
Looking for free Denver music? City Park in downtown Denver has a free summer jazz concert schedule with top performers.
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.
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.
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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Prospect Artists Studio Tour
Art tours are always popular in Colorado, with several art centers located throughout the state. One of the main art districts on the front range is Prospect New Town in Longmont. The Prospect Artists in Longmont, Colorado open their studios each year for the last weekend of June. You will have the opportunity to view each artists' latest work and see the interior of each member's home or store front in this architecturally unique community. This is a special community of artists with unique expressions to match the unique architecture where they live and work.
2012 Schedule:
Saturday June 30 and Sunday July 1, 2012.
12 noon to 6 pm each day.
Where:
Prospect New Town.
Near Pike Road and North 107th Street
Longmont, Colorado, 80504.
Look for the green studio tour signs in front of the studio locations.
A map of the tour is available at www.prospectartistsassn.com.
For the latest details check the Prospect Artists Association web site:
Patsy's Candies Tour in Colorado Springs (always free)
Patsy's Candies in Colorado Springs takes the making of chocolate candy to a whole new level. Free tours of their factory demonstrate the handcrafted nature of Patsy's Candies and highlight the artisanship present in their high quality candies.
Half Fast Subs (Boulder)
Half Fast Subs in Boulder has one of the largest menu choices I've ever seen at a restaurant. The hardest thing to do at this place it to make a decision between the hot subs, cold subs, veggie subs and even salads. Whatever you chose, you won't be disappointed.
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.
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.
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.
Ruby Hill Rail Yard
For about 6 weeks each year in January and February, Ruby Hill Park in Denver features a free ski and snowboard park known as Ruby Hill Rail Yard.