Documentary Discovery: 2:30 p.m., Meadows Branch Library, 4800 Baseline Road, Boulder. Discover more about the world through documentaries. Watch a matinee showing of the 1984 documentary “Before Stonewall.” Snacks provided. Runtime 87 minutes. Closed captions provided. For ages 16 and up. calendar.boulderlibrary.org.

Wildflower ID evening hike: 5:30 p.m., Chautauqua, 900 Baseline Road, Boulder. If you’ve ever wondered about all the wildflowers that can be seen when hiking, take a fun-filled walk on trails to learn flower ID skills. During the hike, there will be discussion about flower families and traditional uses for flowers. Come and discover how these beautiful plants are named. $20, 303-651-8404, rec.ci.longmont.co.us.

Stroke & Stride: 6 p.m., Boulder Reservoir, 5100 51st St., Boulder. Stroke & Stride offers Boulder area athletes a 750 or 1,500 meter swim in Boulder Reservoir, followed by a 5K run on the reservoir dam throughout the summer. $35-$210, withoutlimits.co.

Enchanted Mesa Group Hike: 8-9 a.m. Friday, Colorado Chautauqua — Academic Hall, 298 Morning Glory Road, Boulder. This tranquil, beginner-friendly 2-mile trail features a gentle 500-foot elevation gain. Bring a hat, water bottle, and wear comfortable, sturdy shoes. Hikers will be required to sign an experience event liability waiver when checking in for the hike. Free, chautauqua.com.

Ramble & Write: 1 p.m. Friday, George Reynolds Branch, 3595 Table Mesa Drive, Boulder. Get fresh air and light exercise, reflect on life and socialize at the monthly Ramble & Write meetings. Participants will receive a reflective writing prompt, go for a short walk to brainstorm and chat and return to the library for a writing session and optional sharing time. Journals and pens will be provided for participants to keep, while resources last. Refreshments will be available at the library, though participants are encouraged to bring a water bottle for the walk. For ages 60 and up. Registration required. calendar.boulderlibrary.org.

Signs of the Times Exhibit at the Museum of Boulder: 9 a.m. Friday, Museum of Boulder, 2205 Broadway, Boulder. Made up of signs from the museum’s collection, the exhibit evokes memories of shared experiences and places found in Boulder’s past. No matter how made, every sign has a story to tell. It’s our community’s story and a great way to share Boulder’s history. Free-$10, 303-449-3464, museumofboulder.org.

Virtual All Ages Storytime Online: 10 a.m., Boulder Public Library, 1001 Arapahoe Ave., Boulder.Enjoy books, songs and more at weekly virtual storytime for all ages. calendar.boulderlibrary.org.

All Ages Storytime In-Person: 10:15 a.m. Friday, George Reynolds Branch, 3595 Table Mesa Drive, Boulder. Enjoy books, songs and more. calendar.boulderlibrary.org.

All Ages Storytime at NoBo: 10:15 a.m. Friday, NoBo Corner Library, 4600 Broadway, Boulder. Enjoy books, songs and more. calendar.boulderlibrary.org.

Playtime Storytime In-Person: 10:15 a.m. Friday, Meadows Branch Library, 4800 Baseline Road, Boulder. Share books, sing songs and play while fostering early literacy skills. calendar.boulderlibrary.org.

Steve Glotzer concert: 5 p.m. Friday, Kin Studio and Gallery, 4725 16th St., Studio 104, Boulder. Steve Glotzer is a guitarist with a rich career spanning over 50 years. Glotzer’s music style is a unique blend of folk, Latin, jazz, acoustic and blues. Free, kinstudioboulder.com.

Peter Sommer Septet concert: 6:30 p.m. Friday, Full Cycle Café & Bar, 2355 30th St., Boulder. The Peter Sommer Septet was formed in 2016 to celebrate the music of the great jazz composers and the artistry of the Front Range jazz community. The group regularly performs the music of Duke Ellington, Billy Strayhorn, Thelonious Monk, Charles Mingus and John Coltrane, as well as original compositions by Sommer. $20-$25, fullcyclecafebar.eventcalendarapp.com.

Colorado Triathlon: 5:45 a.m. Saturday, Boulder Reservoir, 5100 51st St., Boulder. Colorado Triathlon is where Colorado comes to race, featuring sprint and Olympic distances, duathlon and aqua bike options. There will be food and beverages provided by Noodles & Co., athlete hoodie sweatshirts and swag bags. $100-$155, withoutlimits.co.

Summer Yoga Series: 9 a.m. Saturday, Museum of Boulder, 2205 Broadway, Boulder. Start Saturday with an invigorating and relaxing rooftop yoga class that enhances the mind-body connection. This all-levels yoga class will take participants through a slow sequence of satisfying poses that promote strength, mobility, balance and ease as they enjoy a beautiful view of the Flatirons. This class is appropriate for all levels of experience, and modifications will be offered. Bring a mat from home. $23, museumofboulder.org.

Editor’s note: Availability and scheduling of events may be subject to change.