Schemers is a study group for those interested in exploring Structure and Interpretations of Computer Programming (SICP), an introductory Computer Science textbook used by MIT. The textbook is available in its entirety online for free: http://mitpress.mit.edu/sicp/
The book uses the Scheme dialect of Lisp, and thus the name of the group.
This will be the first session. We will be setting up testing environments and discussing Section 1.1: http://mitpress.mit.edu/sicp/full-text/book/book-Z-H-10.html#%_sec_1.1
You should read the section and take a stab at the exercises before the meeting.