Camping Sessions cannot be booked in sched.com directly.
Find Wally to book your session. You are likely to spot him at the registration desk or over by the tents.
Wally will take walk-ups on a case-by-case basis throughout the week. Just ask if anything is currently open.
Limit: 1 session per attendee max per day (but again, if a tent is open when you walk-up, Wally can let you in).