Free things to do this weekend in and around Denver

Denver's Top Picks for FREE family-friendly fun Friday, September 18, 2026 to Sunday, September 20, 2026.

(Scroll down for full, detailed list of free weekend activities.)

FREE fall and holiday mini photo sessions with Shoott! - Denver - Shoott - Broadway, New York, NY, USA, September 18, 2026 to Sunday, September 20, 2026, See link for times

Just Between Friends Douglas County - Just Between Friends Douglas County - 500 Fairgrounds Road, Castle Rock, CO 80104, United States, September 18, 2026 to Sunday, September 20, 2026, 9 am

Music on the Patio at Lone Tree Golf Club & Hotel - Lone Tree Golf Club & Hotel - Sunningdale Boulevard, Lone Tree, CO, USA, September 18, 2026 to Saturday, September 19, 2026, 6 pm

Music on the Patio at South Suburban Golf Course - South Suburban Golf Course - South Colorado Boulevard, Centennial, CO, USA, September 18, 2026 to Friday, September 25, 2026, Fridays, 6-9 pm | Sundays, 3-6 pm

2026 Colorado Mineral, Fossil, Gem, and Jewelry Show - 4600 North Humboldt Street, Denver, Denver, CO 80216, United States, September 18, 2026 to Sunday, September 20, 2026, 9 am - 6 pm

Fourth Annual Dog-Eared Pages Book Drive - YellowDog Design, Print and Marketing - Steele Street, Denver, CO, USA, September 18, 2026 to Sunday, September 20, 2026, 9:00AM

Mythical Storytime with Fantasy Friends - Audacious Immersive - 1373 N Grant St. Denver, CO 80203, Sunday, September 20, 2026, 1:00pm

ART ON THE GREEN - Curtis Park, Denver, CO, USA, Saturday, September 19, 2026 to Sunday, September 20, 2026, 10 am - 5 pm

Kids Zone: Animals on Coins - Edward C. Rochette Money Museum, Sunday, September 19, 2026, 11 am to 12 pm

Pirate Fest 2026 - E.B. Rains Jr. Memorial Park - Community Center Drive, Northglenn, CO, USA, Sunday, September 20, 2026, 12 pm - 10 pm

Produce in the Park - Mercado en el Parque - Collyer Park - Collyer Street, Longmont, CO, USA, Sunday, September 20, 2026, 1 pm - 2 pm

Far East Center Mid-Autumn Festival 2026 - Far East Center - South Federal Boulevard, Denver, CO, USA, Sunday, September 20, 2026, 2 pm - 10 pm

Thornton 70th Anniversary History Exhibit - Thornton Arts & Culture Center - Dorothy Boulevard, Thornton, CO, USA, Friday, September 18, 2026 to Sunday, September 20, 2026, 10 am - 5 pm

Miners Day 2026 - Frederick - Centennial Park - Eighth Street, Frederick, CO, USA, Saturday, September 19, 2026, see website

2026 Colorado Mineral, Fossil, Gem, and Jewelry Show - 4600 North Humboldt Street, Denver, Denver, CO 80216, United States, Friday, September 18, 2026 to Sunday, September 20, 2026, 9 am - 6 pm

Miller Farms Annual Fall Harvest Festival - Miller Farms - County Road 19, Platteville, CO 80651, United States, Friday, September 18, 2026 to Sunday, September 20, 2026, See website

Fourth Annual Dog-Eared Pages Book Drive - YellowDog Design, Print and Marketing - Steele Street, Denver, CO, USA, Friday, September 18, 2026 to Sunday, September 20, 2026, 9:00AM

Just Between Friends Douglas County - Just Between Friends Douglas County - 500 Fairgrounds Road, Castle Rock, CO 80104, United States, Friday, September 18, 2026 to Sunday, September 20, 2026, 9 am