Welcome to CD.
The FIRST website has a search function to find teams in your state at
http://usfirst.org/whatsgoingon.aspx. Select
FIRST Robotics Competition, de-select events, and select California. There are 117 teams with two in the San Mateo area. One is established and one is a second year team. The website for 840 (Aragon Robotics) is
http://www.aragonrobotics.org/ and they list their email address as
aragon.robotics.team@gmail.com.