Enchanted Mesa group hike: 8 a.m., Academic Hall, 298 Morning Glory Drive, Boulder. Group hikes take place every Friday through October. This tranquil, beginner-friendly two-mile trail features a gentle 500-foot elevation gain — perfect for soaking in nature’s beauty at a relaxed pace. 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. Registration required. Free, chautauqua.com.

Historic landmark designation and Boulder County flag raising: 10 a.m., Museum of Boulder, 2205 Broadway, Boulder. Join Rocky Mountain Equality, Boulder County and Downtown Boulder Partnership to celebrate the official unveiling of the National Historic Landmark plaque at the Boulder County Courthouse and the Rainbows Over Boulder County flag raising for Pride Month. 303-449-3464, museumofboulder.org.

“Unlocking Hope” exhibit opening: 6 p.m., NoBo Art Center, 4929 Broadway Unit E, Boulder. “Unlocking Hope” is a new solo exhibition by Jesse Ryan Crosby, a multidisciplinary artist, poet and musician whose work explores identity, memory, grief and healing through photography, printmaking, writing and video. Free, 919-522-1981, noboartdistrict.org.

Tom Weiser Quartet concert: 6:30 p.m., Full Cycle Café & Bar, 2355 30th St., Boulder. Tom Weiser performs the music of the golden age of jazz and the American Songbook. He also has a fondness for jazzy adaptations of more contemporary music. The band is comprised of Kyle Matsuda on keys, Cian Krueger on sax, Wyatt Wear on bass and BK Kahn on drums. $20-$25, fullcyclecafebar.com.

Organic plant exchange: 9 a.m. Saturday, Unitarian Universalist Church, 5001 Pennsylvania Ave., Boulder area. Pesticides are difficult to avoid, but they harm pollinators and undermine human health. So attend this organic plant swap. Dig up extra plants that have not been treated with pesticides, put them in a pot and bring them to the plant exchange. There will be plenty of plants for those that don’t have any to bring. Free, sierraclub.org.

“Surf’s Up” film screening: 1:30 p.m. Saturday, Meadows Branch Library, 4800 Baseline Road, Boulder. Watch a matinee showing of “Surf’s Up” with family and friends. Make a pre-movie craft at 1:30 p.m. The movie starts at 2 p.m. Snacks provided. All ages welcome. 85 minutes. Rated PG. Closed captions provided. Movie Matinee at Meadows takes place on the last Saturday of each month. calendar.boulderlibrary.org.

Kat Ellis Ensemble concert: 6:30 p.m. Saturday, Full Cycle Café & Bar, 2355 30th St., Boulder. Celebrate the close of May with a night of jazz led by Kat Ellis. Known for her emotive voice and captivating storytelling, Ellis will present a program of inspired interpretations centered on the evocative theme of summer. From sultry ballads to vibrant swing, her set promises a rich journey through the season’s moods. $20-$25, fullcyclecafebar.com.

Sundays on West Pearl: 10 a.m. Sunday, The New Local, 741 Pearl St., Boulder. Come celebrate the launch of the second annual free summer series with art activities including chalk marbled flowers, paper bugs and watercolor painting. Boulder Ensemble Theatre Company will be doing family-friendly improv at The New Local Annex, Fawns Leap will be designing bouquets for sale and live jazz will be played outside Spruce Confections. The series runs every Sunday through the end of September. Free, donations appreciated. thenew-local.org.

Summer Heritage Morning: 10 a.m. Sunday, Walker Ranch Homestead, 7701 Flagstaff Road, Boulder area. Embark on an unforgettable journey to the past with this immersive historical event. Wander through Walker Ranch Homestead and encounter friendly costumed volunteers who bring the history of the ranch to life. These knowledgeable guides will demonstrate the daily tasks and traditions of the era. Play games and have some family fun. Free, bouldercounty.gov.

Reynolds Summer of Discovery Kickoff Party: noon Sunday, George Reynolds Branch, 3595 Table Mesa Drive, Boulder. Celebrate the beginning of Summer of Discovery with magic, a messy painting craft and a explosion of color while enjoying global snacks. Wear light/white clothes and bring sunglasses/goggles. Explore summer events for all ages, and sign up for the Summer of Discovery challenge. calendar.boulderlibrary.org.

“Luca” film screening: 2 p.m. Sunday, Boulder Public Library, 1001 Arapahoe Ave., Boulder. Celebrate National Ocean Month, Reef Awareness Day, Pride and the Summer of Discovery with crafts, face painting, a mermaid parade and the movie “Luca.” Come out for all or part of the activities. Sea creature dress up is encouraged. “Luca” is a coming of age story, set on the Italian Riviera, of an unlikely but strong friendship that grows between a human being and a sea monster disguised as a human. Seats are first come, first serve. calendar.boulderlibrary.org.

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