Their website says:
"All of our guests (excluding Captains) will be doing talk sessions on our B Stage, seats will be available on a first come first served basis at the event and will be free of charge. Talks will happen on Saturday and on Sunday, tickets available whilst stocks last."
There are 5 Captains and 37 additional guests. That means there should be 37 'free' talks.
That's given me the biggest laugh I've had all day.