Here's a thought - usually, IF a liberal is going to have a question-and-answer session, there's going to be a "pre-screener" to be sure only softball questions are thrown. So if you're going, prepare a couple of mealy-mouthed questions (you know, "Mr. Moore, have you received any death threats because of your courageous stand?") to tell the screener, and then, if and when you get the microphone, ask the REAL question. ("Mr. Moore, why do you feel it necessary to lie about . . . ")
And keep the questions short, succinct, simple, well-researched, and to the point. Ask a long, rambling question, and you'll lose the audience.
It would help if you could enlist a few others, too . . .