March 7, 2026 10 a.m. - 5 p.m. Free Admission Rain or Shine Parking $10 100+ Exhibits Expo Day is back at Petco Park. Free admission. No tickets. No registration. Just show up. Over 100 hands-on exhibits fill the ballpark, drawing more than 20,000 visitors and making this the largest event of its kind in Southern California. Programming spans the full STEAM spectrum — science, technology, engineering, arts, and math — with exhibits designed for everyone from pre-K to grandparents. A little history: Expo Day launched in 2009 at Balboa Park before finding a long-term home at Petco Park from 2010 through 2023 — thirteen consecutive years. The 2026 edition marks its return. What's there: The Illumina Stage in Gallagher Square anchors the main performances, with acts including "The Music Notes" (math-themed rap), a fusion energy show from General Atomics, and the Fleet Science Center’s “Don’t Try This at Home” demonstration. Beyond the stage, the venue is organized into specialty zones: Art pavilion: The “A” in STEAM gets its own space. Includes a baby cap knitting station from "The Madhatters" benefiting local children’s hospitals. Robotics round-up: Hands-on robot demonstrations and interactive play for all ages. Cybersecurity zone: Intro-level explorations of digital safety and tech careers. Construction corner: Hands-on building and engineering projects. College & Career connections: Aimed at middle and high schoolers. Panels at 11 a.m. and 2 p.m. featuring industry pros and SDSU reps. Pre-K zone: Sensory-focused, age-appropriate activities scaled for the youngest visitors. Slime-making, virtual reality, and rocket launches fill out the general floor. The high-traffic stations — slime and VR especially — will draw lines fast once the crowds arrive mid-morning. Visit: https://www.lovestemsd.org/expo-day-2026 lovestemsd on Instagram and Facebook
