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Meta legal action forces Facebook whistleblower to sit in silence at Hay festival
(www.theguardian.com)
This is a most excellent place for technology news and articles.
Should get to the seat, wait for it to begin, pull out duck tape and put it over her mouth as she sits silent.
Logistically it's difficult to carry around a premeasured piece of duck tape, especially since half her clothes have no pockets, but you could tape it to your wrist inside a long loose sleeve or something. Would also make the adhesive less adhesive to your lips when it's time to get it off.
Wax paper generally works pretty well for transporting stickers and tape.