Take a look at the syllabus and see what kinds of topics and readings are covered in each section. Then go to the Google doc to sign up for a section to be “on call” here: https://docs.google.com/spreadsheet/ccc?key=0Akeq1wHDHTE5dHE2SFZxNWxIRzZIaTFXMGIxZ2dzV0E&hl=en_US#gid=0