# Event Details - **Event Name**: National STEM Festival: Open Build Day (FREE Public Expo, All Ages) - **Event Start and End Date**: Sat, 27 Jun, 2026 at 10:00 am – Sat, 27 Jun, 2026 at 05:30 pm (-04:00) - **Event Description**: EXPLR's National STEM Festival’s FREE public expo — hands-on builds + teen innovation showcases. All ages welcome.About this EventWelcome to the NATIONAL STEM FESTIVAL — Open Build DayThe 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)What to expectMeet 50+ National STEM Champions as they showcase breakthrough projects in AI, health & medicine, sustainability, aerospace, and moreJump 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-upsLive moments + broadcast highlights (select programming may be livestreamed)Giveaways and take-home resources (while supplies last)Who should attendFamilies & caregivers looking for a fun, meaningful day outStudents (Grades K–12) who want to build, experiment, and discoverEducators & school leaders seeking ideas, resources, and inspirationSTEM professionals who want to connect and support youth innovationCollege & university reps eager to meet future buildersAnyone curious about STEM — if you like making, creating, and learning, you belong hereRegistration infoThis 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.About the National STEM Festival powered by EXPLRThe 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.) - **Event URL**: https://allevents.in/washington/national-stem-festival-open-build-day-free-public-expo-all-ages/100001984162669958 - **Event Categories**: Festivals, Business, Exhibitions, Kids, health-wellness - **Interested Audience**: - total_interested_count: 0 ## Ticket Details - **Ticket Price Range**: min: 0, max: 0, currency: USD ## Event venue details - **city**: Washington - **state**: DC - **country**: United States - **location**: 1850 K St NW - **lat**: 38.90227039999999 - **long**: -77.0430975 - **full address**: 1850 K St NW, 1850 K Street Northwest, Washington, United States ## Event gallery - **Alt text**: National STEM Festival: Open Build Day (FREE Public Expo, All Ages) - **Image URL**: https://cdn-az.allevents.in/events6/banners/96dfb8e94a4c2ab7d90850bd8890c5d5492f47c173d358ed87115f2520a72fcc-rimg-w1200-h600-dc060606-gmir.jpg?v=1772552825 ## FAQs - **Q**: When and where is National STEM Festival: Open Build Day (FREE Public Expo, All Ages) being held? - **A:** National STEM Festival: Open Build Day (FREE Public Expo, All Ages) takes place on Sat, 27 Jun, 2026 at 10:00 am to Sat, 27 Jun, 2026 at 05:30 pm at 1850 K St NW, 1850 K Street Northwest, Washington, United States. - **Q**: Who is organizing National STEM Festival: Open Build Day (FREE Public Expo, All Ages)? - **A:** National STEM Festival: Open Build Day (FREE Public Expo, All Ages) is organized by EXPLR PBC Inc. - **Q**: Who is this event for? Is it right for me? - **A:** National STEM Festival: Open Build Day (FREE Public Expo, All Ages) is ideal for learners, working professionals, and skill-builders looking to gain hands-on knowledge and practical expertise in a focused, interactive setting. Whether you're a first-time attendee or a longtime enthusiast in Washington, this event is thoughtfully curated to deliver a standout experience worth every moment. 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