National STEM Festival: Open Build Day (FREE Public Expo, All Ages)

Welcome to the NATIONAL STEM FESTIVAL — Open Build Day

The National STEM Festival is an official program partner of America250 — and the Open Build Day is our all-ages public expo celebrating the next generation of builders and the partners helping drive American innovation.

FREE • All ages welcome • Registration required (capacity is limited)

• Meet 50+ National STEM Champions as they showcase breakthrough projects in AI, health & medicine, sustainability, aerospace, and more
• Jump into 20+ hands-on STEM experiences led by industry and community partners (final activation lineup will be announced soon)
• Family-friendly programming designed to spark curiosity for kids, teens, and grown-ups
• Live moments + broadcast highlights (select programming may be livestreamed)
• Giveaways and take-home resources (while supplies last)

• Families & caregivers looking for a fun, meaningful day out
• Students (Grades K–12) who want to build, experiment, and discover
• Educators & school leaders seeking ideas, resources, and inspiration
• STEM professionals who want to connect and support youth innovation
• College & university reps eager to meet future builders
• Anyone curious about STEM — if you like making, creating, and learning, you belong here

This event is free and open to the public, but registration is required due to venue capacity.
Reserve your spot early—walk-ins may be limited.

The National STEM Festival brings together the nation’s most innovative middle and high school students and the organizations helping shape the future—from educators and engineers to companies and community partners—through immersive, career-connected experiences in Washington, D.C. and online.

(Exhibitors, hands-on experiences, and activation details will be added as they’re confirmed.)

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Host or Publisher EXPLR PBC Inc