Science & Engineering Expo Day at Petco Park.
Saturday, March 3-11, 2018
It's FREE to the public and open from 10a.m. – 5p.m. Parking is available for $5 in the Tailgate lot and Padres Parkade, but the trolley is a great way to visit, too.
And,
here is a link to the Science and Engineering festival acitivies in March.