Hot Buttered Rum performance: 8 p.m. Thursday, The Velvet Elk Lounge, 2037 13th St., Boulder. Hot Buttered Rum, a souped-up, left-coast string band, is the brainchild of uniquely gifted musicians who weave their love of bluegrass, folk, jazz and soul into a riveting strain of Americana. String bass and five-alarm fiddle merge with guitar, banjo, mandolin, drums and keyboards to frame the voices of its two contrasting writers, fueling a dance party with roots in Appalachia and its branches in California. Twenty years into its journey, HBR’s music, dreamed up in the backcountry of the High Sierra and the basements of San Francisco, has found its way into the hearts, minds and bodies of fans nationwide. The band continues to tour year-round in support of its many albums and social causes. $26, 303-993-8743, etix.com.

Pizza Party Thursdays: 4 p.m. Thursday, Boulder Public Library, 1001 Arapahoe Ave., Boulder. Come hang out with friends or make some new ones in the Teen Space while enjoying pizza. Play video games, make arts and crafts or just hang out. Pizza Party Thursdays are every second Thursday of the month in the Main Library’s Teen Space. For grades 6-12. calendar.boulderlibrary.org.

Ancient Forests and Ancient Imagination program: 3 p.m. Friday, Boulder Public Library, 1001 Arapahoe Ave., Boulder. Learn about the importance of old-growth forests and humanity’s long-standing relationship with them. Via a slide show and talk, attendees will be delving into the book “Evergreen,” a poetic journey into the heart of the forest. This is a non-profit, where all sales from each book are donated to organizations helping to protect, preserve and even propagate ancient forests and wild open spaces. calendar.boulderlibrary.org.

National History Day Workshop: 5:30 p.m. Friday, George Reynolds Branch, 3595 Table Mesa Drive, Boulder. Register for a 30-minute session of individualized research help with experienced mentors. Review a research and thesis, and receive overall feedback on projects. Students collaborating may attend sessions together. calendar.boulderlibrary.org.

“A Tale of a Tiger” performance: 7:30 p.m. Friday, Dairy Arts Center, 2590 Walnut St., Boulder. “A Tale of a Tiger” is an award-winning Israeli-American adaptation of an Italian Nobel Prize Laureate play, based on an ancient Chinese theatre folk tale, with roots in an Indian myth. A seriously hilarious tale of a soldier who is shot in the Himalayas and left to die. The soldier is saved by a tigress who feeds him of her milk and heals his wounds with her saliva. His life regained, the soldier re-determines the personal and moral standards by which he is to live. $15-$23, 303-444-7328, thedairy.org.

Delta Sonics at Full Cycle Café: 6:30 p.m. Friday, Full Cycle Café and Bar, 2355 30th St., Boulder. The Delta Sonics are a Colorado Blues Quartet featuring Al Chesis on harmonica/vocals, Bob Pelligrino on guitar/vocals, Stefan Flores on drums and Alissa Chesis on bass. The Sonics have been the Mile High “go-to” band for touring blues national acts for nearly 15 years. The band has backed national blues acts like Big Bill Morganfield, Steadyrollin’ Bob Margolin, Ronnie Baker Brooks, Grammy-nominated Lurrie Bell, Grammy-nominated John Primer, the late Pinetop Perkins and the late Bo Diddley. $20-$25, fullcyclecafebar.eventcalendarapp.com.