Some 25,000 science lovers are expected to converge on Petco Park Saturday for the annual San Diego Festival of Science and Engineering.

From Star Wars to steampunk, the expo features hands-on exhibits, presentations and activities provided by 130 local businesses, corporations, and organizations from all parts of Southern California.

The event is aimed at future scientists from kindergarten to 12th grade to stimulate their interest in science, technology, engineering and math — the STEM disciplines.

The free event takes place on Saturday, March 5, from 10 a.m. to 5 p.m. at Petco Park in downtown San Diego.

It kicks off ten-day educational experience at schools and universities across San Diego County.

Presented by gene-sequencing innovator Illumina, the festival is a program of the BIOCOM Institute in partnership with UC San Diego, Reuben H. Fleet Science Center and the San Diego County Office of Education.

Chris Jennewein is founder and senior editor of Times of San Diego.