SVEC has many STEM outreach opportunities we help promote. 

For announcements of volunteering opportunities join this Meetup group:

https://www.meetup.com/STEMVolunteering/

Some of the events we participate in annually include: 

Maker Faire Bay Area - we always have a booth with many engineering projects for kids and also supply many volunteers for the "learn to solder" booth (our booth from last year

FIRST Robotics Silicon Valley Regional - we supply many volunteers to help judge and run the competition

Synopsys Science Fair Championship - many judges are needed