Johnny Johnston and Felonius Smith concert: 6 p.m., City Star Brewing, 321 Mountain Ave., Berthoud. Two slide guitar and fingerpickin’ masters, Johnny and Felonius feature a gumbo of American roots music from the 1920s to the 1950s — Delta blues, country blues, urban blues, jazz, folk and rock — featuring bottleneck slide guitar, dobro, guitar, mandolin and vocals. Free, 970-532-7827, citystarbrewing.com.

TEN Pearl Jam tribute concert: 5:30 p.m., Wibby Brewing, 209 Emery St., Longmont. TEN is Colorado’s tribute to Pearl Jam. This free outdoor concert offers fans an authentic Pearl Jam experience, complete with energetic live renditions of classic hits. Free, 303-776-4594, facebook.com.

Steel Monkey concert: 6 p.m., Bricks on Main, 471 Main St., Longmont. Steel Monkey Band is a tribute band dedicated to celebrating the music of Ian Anderson and Jethro Tull, known for their distinctive blend of progressive rock, folk and classical influences. The band’s dedication to authenticity and musicianship positions them as a noteworthy act within the tribute band scene, preserving and promoting Jethro Tull’s legacy. Free, 720-600-2350, facebook.com.

Astronomy — A Visible Asteroid program: 7:45 p.m., Ron Stewart Preserve at Rabbit Mountain, 14950 N. 55th St., Longmont. In addition to naked-eye planets and stars, astronomers can also see the asteroid Vesta in May. Learn more about Vesta, plus discover the wandering paths of other asteroids and comets. Viewing with telescopes following the program. Join volunteer naturalists and astronomers from the Longmont Astronomical Society to gaze at the night skies and learn about the cosmos and humanity’s place in the universe. Presentations will be at the picnic shelter, followed by stargazing in the parking area. The Longmont Astronomical Society provides telescopes. Bring a chair or blanket, a light jacket and a red flashlight. Free, boco.org.

Rattlesnake hike: 10 a.m. Saturday, Ron Stewart Preserve at Rabbit Mountain, 14950 N. 55th St., Longmont. Trek through prime rattlesnake habitat and learn about these often misunderstood creatures. Meet at the shelter to share in a discussion about rattlesnake habitat and behavior, and learn things through seeing and feeling. Participants will walk away feeling more comfortable about sharing open space with these scaly friends. Free, discover.bouldercounty.gov.

Nature Therapy Group: 4 p.m. Saturday, Coot Lake, 6247 63rd St., Boulder. Attend a restorative, therapeutic nature experience at Coot Lake. This event is designed for anyone who wants to learn more about nature therapy, better their mental health and reconnect with nature. This session will be focused on interpretation. Participants should bring a small notebook and pen, the Inaturalist app and appropriate shoes and water. Free, eventbrite.com.

Dollhouse Thieves concert: 5 p.m. Saturday, The Garden at Left Hand Brewing, 1245 Boston Ave., Longmont. This talented group blends neo-rock and indie-folk with jazz-inspired vocals and unique instruments like the accordion, clarinet and trombone. Free, lefthandbrewing.com.

Unauthorized Absence concert: 6 p.m. Saturday, Bootstrap Brewing, 142 Pratt St., Longmont. Unauthorized Absence is a classic rock cover band playing songs that transport listeners back to the soundtrack of their youth. bandsintown.com.

Jazz on the Front Porch: 1 p.m. Sunday, Butterscotch Studios, 620 Kimbark St., Longmont. Head to the front lawn of Butterscotch Studios for the kickoff of the Summer Sunday Jazz on the Porch series. The Charles Benzig Trio will provide the perfect soundtrack for a relaxing summer afternoon. Bring a lawn chair and a snack, and enjoy great music and community. Free, 303-483-3257, butterscotchstudios.com.

Sunday Shandy Shakedown concert: 2 p.m. Sunday, The Garden at Left Hand Brewing, 1245 Boston Ave., Longmont. Enjoy good vibes all day with live music by Scott Von and Groove Holiday. Enjoy a full day of music, yard games and sunshine. Free, lefthandbrewing.com.

Seashell ring dishes craft: 2 p.m. Sunday, Jillian Jensen Creative & Events, 324 Main St., Suite G, Longmont. In this workshop, turn real seashells into trinket dishes using paint, decoupage and gilded gold edges. Participants will go home with a set of three handmade dishes perfect for rings, earrings or just sitting on the nightstand. $33, eventbrite.com.

Memorial Day service and picnic: 1 p.m. Monday, American Legion , 4760 28th St., Boulder. To honor Memorial Day, Boulder Post No. 10 American Legion will be hosting a program at the Legion. Following the program, attendees will adjourn to the pavilion for a wreath laying ceremony. The picnic will begin at 2 p.m. All Post 10 member organizations, veterans and their families and guests, and the public are invited to attend. The Post will provide the main course. Everyone attending is expected to bring a side dish or dessert to share. Live music will be provided by the Dream Team. Free, 303-442-9551, boulderlegion.org.

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