Keeping the Audience Safe

From my field notes of the July Carapace:

The MC instructed the audience not to boo. Looking around the audience, he noticed a couple of children at tables. At least one of those tables had not come specifically for Carapace. They were just in the room when it started. The MC instructed the tellers to “be aware of the audience.” But then he said that we do share adult themes at Carapace and don’t censor people.

This intro did not make it very clear who was “safe.” Was it a safe space for the tellers to say whatever the needed to say, without censorship? Or was it a safe space for the audience, where they wouldn’t hear anything too offensive?