“Meet Me in St. Louis” film screening: 1 p.m., Boulder Public Library, 1001 Arapahoe Ave., Boulder. Spend Friday afternoon in the Canyon Theater watching “Meet Me in St. Louis.” Closed captions displayed when available. Coffee provided. calendar.boulderlibrary.org.

Twilight Hike: 7 p.m., Heil Valley Ranch, 1188 Geer Canyon Road, Boulder. Welcome summer with a 1.5-mile hike on the longest day of the year. Discover twilight wildlife activity and hear solstice stories from around the world. This program is for adults and families with children ages 6 and older. Free, boco.org.

The English Beat concert: 8 p.m., Boulder Theater, 2032 14th St., Boulder. The English Beat is a band with an energetic mix of musical styles and a sound like no other. The band’s unique sound has allowed it to endure for nearly four decades and appeal to fans, young and old, all over the world. Consummate showman that he is, Dave Wakeling continues to keep The Beat alive and strong, touring the world as The English Beat with an amazing all-star ska backing band playing all the hits of The Beat, General Public and songs from his new album “Here We Go Love.” $30-$35, z2ent.com.

Summer Vibes Bike Rally and Run Festival: 9 a.m. Saturday, Bohn Park, 199 Second Ave., Lyons. After a five-year hiatus, the festival is back with rock bands, cold beers, BMX dirt jump jam, the Beer Relay and camping. New to the event are two gravel bike races, a five-mile Trail Dog run, saunas and two lounge pools to cool down in while watching the bands or after a bike/run adventure. Free-$170, summervibesrally.com.

Flatiron Sounds Music Festival: 1 p.m. Saturday, The Green at The Civic Area, 1056 Canyon Blvd., Boulder. Join for an unforgettable outdoor music festival experience. Explore the vibrant vendor market, savor delicious bites from local food vendors and sip on refreshing brews and cocktails. With captivating live music performances throughout the day, this event promises endless fun for the whole family. Free, chautauqua.com.

Niwot Jazz Festival: 3 p.m. Saturday, Cottonwood Square Shopping Center, 7960 Niwot Road, Niwot. Now in its fourth year, the Niwot Jazz Festival continues the tradition of bringing high quality jazz music to Niwot, attracting 800-1,000 visitors each year. The musical line up this year includes After Midnight, Angela Bingham, Brian Lynch with the Keith Waters Trio and saxophonist Peter Sommer and a salsa dance party with Quemando. Free, 720-492-3124.

“The Rocky Horror Picture Show” film screening: 7 p.m. Saturday, Boulder Public Library, 1001 Arapahoe Ave., Boulder. Enjoy a shadow-casted screening of “The Rocky Horror Picture Show” at this special after-hours event starring Colorado’s Elusive Ingredient. Rated R. Runtime 1 hour 40 minutes. Closed captions provided. Each one of the on stage performers will dress up as one of the on screen characters and mirror, or shadow, their movements as exactly as possible for most of the movie. Registration required. calendar.boulderlibrary.org.

Quilters Fabric Swap: 1 p.m. Sunday, George Reynolds Branch, 3595 Table Mesa Drive, Boulder. Swap cotton fabric, and socialize with other quilters. Coffee and tea will be available. calendar.boulderlibrary.org.

Art in the Dark: 3 p.m. Sunday, Meadows Branch Library, 4800 Baseline Road, Boulder. Explore the fascinating world of bioluminescence in this unique art and science workshop. Learn about animals, plants and fungi that naturally glow. Then, use UV light-reactive paints to create artwork inspired by these amazing natural phenomena. Celebrate the vibrant beauty of summer through this creative and engaging program. All materials provided. For grades 6-12. calendar.boulderlibrary.org.

The Dewey Deci-Flow Yoga: 3 p.m. Sunday, NoBo Corner Library, 4600 Broadway, Boulder. A monthly yoga session blending mindful movement, live music and guided breathwork. Beginner friendly. Registration required. calendar.boulderlibrary.org.

The Mariposa Collective’s Solstice Soirée: 5 p.m. Sunday, Glen Huntington Bandshell, 1212 Canyon Blvd., Boulder. The Mariposa Collective invites the community to its Solstice Soirée, a vibrant summer celebration and fundraiser. Bring a picnic, bring friends and join for a joyful gathering full of interactive activities, live performances and a silent auction in support of the group’s upcoming production “Resonance.” Free, facebook.com.

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