Bike Chains & Derailleurs workshop — Join REI’s expert bike techs for a workshop on how to care for and maintain derailleurs and bike chains. We’ll tune derailleurs, adjust barrel adjusters and diagnose common chain issues. Bring a bike or practice on one of ours. Food and drinks available for purchase; 6 p.m., Sept. 10, Finkel & Garf Brewing Company, 5455 Spine Road, Boulder; $40-$60; 303-583-9970.

Boat Race Science — Join us for a STEM boat building afternoon. Participants will learn some of the science behind what makes a boat float and then have the opportunity to build their very own boat from the supplies given. After, we’ll test the boats for capacity and speed. Registration required; Grades 3-5; 4 p.m., Sept. 10, Erie Community Library, 400 Powers St., Erie; free; 888-861-7323.

Open Mic Night — 6 p.m., Sept. 10, Twisted Pine Brewing, 3201 Walnut St. Suite A, Boulder; free; 303-786-9270.

Boulder Python Monthly Meetup — 6:30 p.m., Sept. 10, Galvanize Boulder-Walnut St., 1023 Walnut St., Boulder.

Claudia Mills: “Nixie Ness, Cooking Star” — Claudia Mills will speak about and sign her new book, “Nixie Ness, Cooking Star”; 6:30 p.m., Sept. 10, Boulder Book Store, 1107 Pearl St., Boulder; free; 303-447-2074.


STEAM Storytime: Constellation Lamps — Each week will feature stories and a STEAM-based activity focusing on science, technology, engineering, art and math concepts. Ages 3 and up; 4 p.m. Wednesday, Sept. 11, NoBo Corner Library, 4600 Broadway, Boulder.

Strengthening Yoga — Unity of Boulder is now offering a Restorative Yoga Class on Wednesdays before our Healing Meditation Service. Pleas bring a mat, water bottle, block and/or strap (if needed) and comfortable clothes. There will be focus on pranayama (breath) as we move through our asanas as well as learning different breathing techniques. Every session will close with savasana (resting pose) along with a guided meditation, aromatherapy and a blessing; 5:30 p.m. Wednesday, Sept. 11, Unity of Boulder Spiritual Center, 2855 Folsom St., Boulder; $10-$12; 303-442-1411.

Boulder StartUp Meetup— Learn from experienced entrepreneurs who will share their stories and the wisdom gained from their unique journey. Network with entrepreneurs, peers and target clients; 5:30 p.m. Wednesday, Sept. 11, NiCHE Workspaces, 944 Pearl St., Boulder.

Zero Waste Happy Hour — Learn about zero-waste practices and support ocean conservation at this special end-of-summer happy hour. Featuring a vegetarian barbecue, kegged craft beer (bring your own cup) and volleyball/spikeball. Dig your toes in the sand and join us for this outdoor farewell to summer; 5:30 p.m. Wednesday, Sept. 11, Ocean First, 3015 Bluff St., Boulder; free; 303-444-7234.

Hemp for Horses: Why, What and How Much? — There a a lot of misconceptions surrounding hemp and cannabis and its use on horses. Join the the Boulder County Horse Association and our presenter Chelsea Luedke to learn more about hemp for horses; 6 p.m. Wednesday, Sept. 11, Upslope Brewery, Boulder, 1898 South Flatiron Court, Boulder; free.

Wild & Edible Plant Walk — The urban landscape in Boulder is full of plants you can eat and make into teas Join local plant experts for a one-hour walk along Boulder Creek to focus on plant identification, talk about the natural versus artificial presence of plants, and collect and spread seeds of wild edible species; 6:30 p.m. Wednesday, Sept. 11, In front of Macky Auditorium, 1595 Pleasant St., Boulder; free; 720-326-9139.

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