Unfortunately, due to work, I missed Friday night last year. Which I still regret. But there were still some bags at the beginning of Saturday from the night before, with the Festival CDs and the Program with the interviews both still in them, so I was happy to still be able to get one. When you get inside Saturday afternoon, just check the table right after you go through the doors.
There were some at the start of Saturday but I noticed they were pretty empty by the end of the evening, so be sure to grab one when you first get there. Granted, it isn't guaranteed that there are any left after Friday night, but I usually notice some.