Crazy 8s Math Club: 3:30 p.m., George Reynolds Branch, 3595 Table Mesa Drive, Boulder. Practice math skills and gain confidence with fun hands-on games that get kids fired up about math. Crazy 8’s is a recreational after-school math club. The group works together to make glow-in-the dark geometry, search for pirate treasure and many other fun math-y activities. For children in grades 3-5. calendar.boulderlibrary.org.

Kelly Hunt concert: 7 p.m., Steinbaugh Pavilion, 824 Front St., Louisville. Kelly Hunt’s improvised style of playing combines old-time picking styles with the percussive origins of the banjo. Her music holds an ineffable quality that hovers beyond the constraints of genre and her intriguing arrangements will leave you spellbound. Free, 303-335-4849, louisville-library.org.

Chicken Coop Willaye and the 2-Bit Pickle: 5 p.m. Friday, Boulder Social, 1600 38th St., Boulder. Visit Boulder Social for live music with Chicken Coop Willaye & the 2-Bit Pickle. Bring yfriends and family for a night of bluegrass, smoked-in-house BBQ specials and ice cold, freshly brewed social beers. Free, 720-716-3345, eventvesta.com.

‘Waiting for Autumn’ exhibit opening: 5 p.m. Friday, Ana’s Art Gallery, 1101 Spruce St., Boulder. Join popular Boulder artist Linda Faul for an opening showcasing new and past work, including “Grazing in the Mountains.” Faul is a powerful colorist who combines realism with a touch of fantasy. Her beautiful mountain scenes incorporate bright colors into landscapes that evoke Colorado’s varying terrain and moods. Faul is known for her buffalo paintings in which oil, acrylic and mineral spirits are layered to create a dreamlike image sought after by collectors. Free, 303-997-5346.

John Gunther & The Bad Hombres at Full Cycle Café: 6:30 p.m. Friday, Full Cycle Café & Bar, 2355 30th St., Boulder. John Gunther & The Bad Hombres are a striking original project from some of Denver’s baddest musicians, brewing a progressive funk sound that draws influences from the likes of Chris Potter and Medeski Martin & Wood. Hear the musical stylings of John Gunther on tenor sax, Tim Wendel on guitar, Gonzalo Teppa on bass and Dru Heller on drums with special guest Chantil Dukart. $20-$25, thetuneupevents.eventcalendarapp.com.

The Sweet Lillies at The Velvet Elk Lounge: 8 p.m. Friday, The Velvet Elk Lounge, 2037 13th St., Boulder. The Sweet Lillies’ music is, first and foremost, heartfelt and collaborative. Those defining traits are given life by the quartet of musicians who make up the Lillies. Together, the members have combined their individual strengths to deliver powerful narratives of life in song. With their lineup of guitar, viola, upright bass, drums and ethereal vocal harmonies that float like a dream, the Sweet Lillies’ music has a hard hitting original flavor with a forward-looking eye. They have incorporated all of their cumulative life-experiences into their music, song-writing and artistry, crafting an uncommonly-beautiful style they have christened “String-Americana” — a nod to the band’s all encompassing musical tastes and willingness to experiment with genres ranging from folk and rock all the way to hip-hop. $20, 303-993-8743, etix.com.