The Whys and Whens of Car Maintenance: 4 p.m., NoBo Corner Library, 4600 Broadway, Boulder. This course is for people who wonder when specific car maintenance tasks are necessary. The class will go over everything from how often you actually need to change your oil to what power steering fluid even does in cars (and why it has to be changed). Everything will be explained in easy-to-understand language, not mechanic talk. Registration required. calendar.boulderlibrary.org.

Good Trouble Lives On: 4:30 p.m., Foothills Parkway, 505 Thunderbird Drive, Boulder. Good Trouble Lives On is a national day of nonviolent action. Demonstrate with South Boulder Visibility Brigade. Free, mmstahl37@gmail.com.

“Kill the Lax Bro” book signing: 6:30 p.m., Boulder Book Store, 1107 Pearl St., Boulder. Charlotte Lillie Balogh will speak about and sign her new book “Kill the Lax Bro.” Free, boulderbookstore.net.

“The Grapes of Wrath” film screening: 1 p.m. Friday, Boulder Public Library, 1001 Arapahoe Ave., Boulder. Spend Friday afternoon in the Canyon Theater watching “The Grapes of Wrath.” Rated PG, runtime 2 hours 15 minutes. Closed captions displayed when available. Coffee provided. calendar.boulderlibrary.org.

Theater Tots: 2:30 p.m. Friday, Meadows Branch Library, 4800 Baseline Road, Boulder. Bring stories to life in this interactive theater program for children ages 4-7. Begin with a lively story time. Then, work together to create simple costumes using craft materials. Kids will have the chance to step into their roles and perform a short, playful version of the story for caregivers and friends. This program fosters creativity, early literacy and confidence in a fun and supportive setting. Children must be accompanied by an adult. calendar.boulderlibrary.org.

Pearl Street Arts Fest: 3 p.m. Friday, Pearl Street Mall, 1303 Pearl St., Boulder. From whimsical and modern sculptures to traditional watercolors, oils and more, Pearl Street Arts Fest is a beautiful outdoor gallery nestled in the heart of downtown Boulder on the renowned Pearl Street Mall. Free, boulderdowntown.com.

Meadow Music at Chautauqua Park: 9:30 a.m. Saturday, Chautauqua Park, 900 Baseline Road, Boulder. A fun-filled kids’ concert featuring original science and nature songs, silly skits and interactive fun, plus a toddler-friendly nature walk before the show. Bring a picnic and stay to play. Free, givebutter.com.

“Hilwa’s Gifts” book signing: 11 a.m. Saturday, Boulder Book Store, 1107 Pearl St., Boulder. Safa Suleiman will speak about and sign her new book “Hilwa’s Gifts”. Free, boulderbookstore.net.

“Happy Gilmore” film screening: 8 p.m. Saturday, Boulder Theater, 2032 14th St., Boulder. In preparation for the release of “Happy Gilmore 2” on July 25, the Boulder Theater will be screening the original “Happy Gilmore.” Come dressed in putting green attire. After his grandmother’s house is repossessed by the IRS, a bad-tempered hockey player takes his talents to golf to earn the big bucks and get his grandmother’s house back. $15, z2ent.com.

Tom Pakele and Stevie Guitar Glotzer concert: 9 p.m. Saturday, License No. 1, 2115 13th St., Boulder. Tom Pakele and Stevie Guitar Glotzer are known for their soulful harmonica and guitar renditions of classic blues hits from legendary artists like Howling Wolf, Junior Wells and Sonny Boy Williamson, as well as their own original music which is a must-experience for any blues enthusiast. With Pakele’s captivating vocals and Glotzer’s masterful guitar work, they bring the timeless sounds of the blues to life in a way that’s both authentic and fresh. license1boulderado.com.

Summer heritage morning at Walker Ranch Homestead: 10 a.m. Sunday, Walker Ranch Homestead, 7701 Flagstaff Road, Boulder. Embark on an unforgettable journey to the past with this immersive historical event that will transport walkers back in time. Talk with costumed volunteers as they demonstrate late 1800s ranch tasks. Free and fun for all ages. Free, boco.org.

Puzzle competition: 1 p.m. Sunday, Boulder Public Library, 1001 Arapahoe Ave., Boulder. Create a team of two to six people to compete in a puzzle competition at the Main Library. First and second place will walk away with a fun prize. Registration required. calendar.boulderlibrary.org.

Laurie D concert: 3 p.m. Sunday, Busey Brews L & L, 70 E. First St., Nederland. Laurie D will be joined by Lorrie Baum as Laurie & Lorrie Duo, this time sharing originals and covers, folk, blues and jazz and any other requests.

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