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Under some of their seats, tape envelopes containing a word or phrase. In your presentation, get everyone to see if they have an envelope and get people who have one to open it and read out what it says. Could be a question you can answer or you could make them all connected to the subject and just ask, "What' s the connection?" [over 14 years ago]
How can I most effectively communicate with large audiences& get their attention
If using PowerPoint (and do consider not) use only pictures on your slides - no words and absolutely no bullet points [over 14 years ago]
How can I most effectively communicate with large audiences& get their attention