I don't know either, same here we went there and the tour was offered. But I think that at 5pm they have one.
Www.templesquare.com
I'm not sure about scheduled tours. I went in and they offered me and my kids a tour
No schedule, just whenever you walk in... Usually any day between 10 am and 8 pm, unless there is a performance or broadcast taking place. (they do a security sweep before events so it's closed hours in advance) If you have a large group or special interest, you can call and schedule a tour.
Tours are free and on demand
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