Not wanting to send my kids to this anymore

My step daughters (17 and 15) and son 14 go to teen day at the library. Today someone came in to teach them to knit and some man came to the group with a camera asking if any of the girls wanted to come with him and saying sexual stuff. The librarian called the cops and he tried to run but they caught him. He said he was just joking and it was a joke. I don't feel comfortable with my kids going there anymore.p