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Thingamajig Invention Convention

Ages 5-14 San Francisco County Fair Building
Sparking Curiosity, Showcasing Youth’s Creativity
Children gather around a science project at an event, observing a contraption with a plastic bottle and white bowl. An adult supervises, and many attendees wear green shirts.

Thingamajig® is a Science Fair & Engineering Expo

Thingamajig® offers more than a dozen hands-on challenges designed to spark curiosity and showcase kids’ S.T.E.A.M. skills while they have fun building or simply designing new inventions. It is in its 29th year nationally, and 9th year at the YMCA of San Francisco. It’s one part science demos and activities and another part engineering competition.

THINGAMAJIG 2018 Invention Convention - San Francisco" on a black background.

Inspire Youth to Be Amazing and Unstoppable!

Join us! The world needs more innovators and hands-on problem-solvers.

WHEN: Friday, June 27, 2025, from 9:45 AM to 2:15 PM

WHO: All K-8th Students enrolled in the YMCA of San Francisco’s Summer Programs

WHERE: The San Francisco County Fair Building, 1199 9th Avenue, San Francisco, CA 94122. Located next to the San Francisco Botanical Garden in Golden Gate Park.

A smiling boy in an orange shirt and camo jacket holds a colorful craft project. He is indoors with other people in the background.

Is your organization interested in group volunteering?

Contact Jennifer Trombley at [email protected].

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Dec 26

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C Sloat – School Year 2024-25 – After School 5 Days

Kids (Ages 0-12), Kids (Ages 0-17)
Stonestown Family YMCA – Deactivated
December 26 at
12:00 am – 11:59 pm
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Dec 26

After School

C Sloat – School Year 2024-25 – After School 3 Days

Kids (Ages 0-12), Kids (Ages 0-17)
Stonestown Family YMCA – Deactivated
December 26 at
12:00 am – 11:59 pm
Every Monday, Tuesday, Wednesday, Thursday, Friday from August 19 to September 13
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Dec 26

After School

Abraham Lincoln – School Year 2024-25 – After School 2 Days

Kids (Ages 0-17), Teen
Stonestown Family YMCA – Deactivated
December 26 at
12:00 am – 11:59 pm
Every Monday, Tuesday, Wednesday, Thursday, Friday from August 19 to September 13
Price: Must be approved by branch to enroll into this option.

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Youth & Family

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