Oh, too late for this, but might be handy for next time:
WonderGurl wrote: topic is so boring that by the time I begin, they'd be bored to tears.
This is not a good start, fronting an audience with a topic you consider boring.
Maybe take a leaf out of sakoz's book, open by telling them they're a bunch of fools believing their own conditioning and that you're going to enlighten them. You could arrange for a friend to stroll in as the bogyman, real scary like, then whip off the sheet and go on with your talk. The jolt of adrenaline might be dysfunctional for
them, but it will serve your purpose of having them on high alert for whatever else you might want to impart.
If, on the other hand, it might suit you better for them to be asleep throughout your speech, you can emulate sakoz again: take the gist of what you want to say and brainstorm about 60 pars making the same statement in each of them, with eye-popping references to authorities as diverse as Plato and Pooh Bear.
Good luck!