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

EXPLR’s National STEM Festival presents Open Build Day — our FREE, all-ages public expo celebrating THE BUILDERS: teen innovators and the partners helping drive American innovation.

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

What to expect: Meet 50+ National STEM Champions showcasing standout projects across AI, health & medicine, sustainability, aerospace, and more. Jump into 20+ hands-on STEM builds led by industry and community partners. Enjoy family-friendly experiences designed to spark curiosity for kids, teens, and grown-ups, plus live moments and broadcast highlights.

Registration: Open Build Day is free and open to the public, but registration is required due to venue capacity. Reserve your spot early — walk-ins may be limited.

About the National STEM Festival powered by EXPLR: The National STEM Festival brings together the nation’s most innovative middle and high school students and the organizations shaping what’s next — 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.)