There will be two pre-sprint sessions that will be run on Sunday afternoon, after the end of the conference talks.
Intro to Sprinting (60 minutes, at 3:20 pm)
This will be a plenary session, and will begin with a talk explaining what sprints are and how we do them at PyCon, followed by a panel discussion where the sprint leaders will answer questions.
Sprint Tutorials (90 minutes to 3 hours, at 4:40 pm)
After a break, participating sprint leaders will gather the sprinters of their projects, go to different rooms, and the project will be explained. Everything from code walkthroughs to granting repository access can be presented here. This way, you'll be able to start working on the sprints effectively on Monday morning, without a long setup delay.