"Caltech Science for March" is an annual outreach event on campus. Scientists from all Caltech divisions share their expertise and knowledge and present educational booths and TED-style talks. Over 2,500 people including families with children attend. This event is one of our ways to give to the local community.
The event is sponsored and organized by the Caltech Postdoc Association
http://cpa.caltech.edu/About_the_CPA