Pizzeria Rustica Cycling Club - 2 p.m. second Sundays, Pizzeria Rustica, 2527 W. Colorado Ave.; pizzeriarustica.com.
Garden of the Gods Visitor and Nature Center - 1805 N. 30th St., free; 219-0104. - Get Fit in the Garden Wellness Walk, 9 a.m. Wednesdays. Registration required.
Rocky Mountain Trails - Information on more than 70 hikes; rockymountainhikingtrails.com.
Open House - To benefit Colorado Springs Therapeutic Riding Center, 10 a.m.-2 p.m., Mark Reyner Stables, 3254 Paseo Road; cstrc.org.
Fountain Creek Nature Center - 320 Peppergrass Lane, Fountain. Reservations: 520-6745. - Summer Night Sky Program with Colorado Springs Astronomical Society, 8-9:30 p.m. Friday, $4. - Nature Quest Nature Camp, for children entering grades 1-5, 9 a.m.-3 p.m. June 11-15, $140.
Florissant Fossil Beds National Monument - Florissant, entrance fee, $7 for 16 or older; 748-3253. - Night Sky Program, 8:30-10:30 a.m. Saturday.
Sunrise nature/wildlife photo shoot - Saturday mornings, Westcliffe, $55. Reservations: 1-303-823-6399, kennethwajda.com/naturewildlife/.
Colorado Birding Trail - Coloradobirdingtrail.com lists places to see birds and wildlife.
Rocky Mountain Conservancy Rocky Mountain National Park Nature Bus Tours - Call or go online for information: 1-970-586-3262, rmconservancy.org.
Gallop in the Garden - 4-6 p.m. Thursdays, Garden of the Gods Park, 1805 N. 30th St. Registration: gardenofgods.com.
Achilles International Pikes Peak Running Club - Nonprofit that uses the power of running to bring hope, inspiration and joy of achievement to people with disabilities, 6:15 p.m. meet and sign in; 6:30-7:30 p.m. run, walk or wheel, Mondays, Colorado Running Co., University Village Center, 5262 N. Nevada Ave., Suite 140; Laura, 331-1011.
Two Elks Runners Club - 5:30-7 p.m. Thursdays, Thunder and Buttons, upstairs, 2415 W. Colorado Ave. Run along midland trail; 447-9888, firstname.lastname@example.org or on Facebook.
Thursday Night Run Club - 6 p.m. Thursdays, Old Chicago's, 7115 Commerce Center Drive; 232-4656, facebook.com/TNRCCOSprings.
Pikes Peak Road Runners - Cost and registration: pprrun.org. - Mueller Marathon, 7 a.m. Saturday, Mueller State Park. - Colorado Springs Heart & Stroke Walk, 8:30 a.m. Saturday, Weidner Field. - Rebel Rose Run, 9 a.m. Saturday, Cottonwood Creek Park. - Garden of the Gods 10 Mile Run, 7 a.m. Sunday, Rock Ledge Ranch. - Springs Spree Super Hero 5K, 9 a.m. Sunday, America the Beautiful Park.
Bigdogbrag: The Colorado Mud Run - Colorado Springs 2018 - 8:30 a.m.-2 p.m., Ram Off Road Park, 12800 Colorado 94, $25-$59. Registration: bigdogbrag.com.
Nature and Raptor Center of Pueblo - Volunteer docents, 5200 Nature Center Road, Pueblo. Registration: 549-2414.
North Cheyenne Cañon Park - Help with outdoor education at Starsmore Visitor and Nature Center; Aaron Rogers, 385-6089, email@example.com.
Mueller State Park - 21045 Colorado 67, Divide, needs volunteers for naturalist programs, trail maintenance, newsletter editing or work in visitor center. Training provided; 687-2366.
Colorado Springs Therapeutic Riding Center at The Mark Reyner Stables - Help special needs people during equine-assisted therapy; 634-4173, cstrc.org.
Bear Creek Nature Center - 245 Bear Creek Road. Reservations: Paula, 520-6387, firstname.lastname@example.org. - Volunteer Morning, for ages 5 and older, 9-11 a.m. Saturday.
Listings are published on a space-available basis. Send information at least two weeks in advance: Email email@example.com.