[cjackson]

Also, you should probably get the phone numbers of your coach/mentors.
Plus, like others said, email is a great tool. Our robotics discussion and planning goes on long after we leave school.
Also, like Steve said: Facebook.
It's the easiest way for us to spread the word to the whole team. Everyone is always checking their facebook, on their phone, or computer. Create a group on Facebook that way you can just mass message everyone on the team.

Also if you have a Mentor that is a teacher, see if he can work something out with the principal so that you can meet whenever. The staff at your school, the principal especially, and the Parent/teacher association or organization can be very valuable resources for all aspects of the build season.