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This is a great opportunity!!!
There may be students there who know nothing about Catholicism, and have never met anyone who represents the Church in this manner. So the impression you give them could last their lifetime.
I recommend that you do some serious praying in advance, to Our Lady (who taught and/or learned from Our Lord Himself as a child), and to St. Francis Xavier, who evangelized the Orient when they had never heard the Gospel.
I would also recommend that you would get in touch with the St. Benedict Center in Richmond N.H., because their motto is "The Conversion of America," and what good does it do to worry about an ignorant noble native in a far away wasteland if you can't convince your own neighbor next door that the Church teaches the truth? They might be able to help you with a Power Point presentation of some kind.
A short video of Don Bosco's missions might be useful because he had a way of bringing joy and enthusiasm into the lives of poor children, and kids always take well to exciting stuff like joy and enthusiasm.
If you could say a few words about "LOVE FOR THE TRUTH," it could well be all news to them. A serious blemish on our modern world is that we have lost our love for the truth. Maybe that will ring true to some of your listeners.
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