Know-How Exchange : Advertising/PR

We are hosting a series of seminars - 5 hours long, all presentations, with different speakers and a number of partners who also participate.

My problem is that no matter how good a presenter, after 2 hours it is pretty boring. We are adding a video, some background music and will try to make it interactive by asking question to the audience and make a few giveaways through the session.

I am looking at ideas - from a tip to a crazy idea - to make the presentations more exciting, more theatrical, more entertaining.

We sell a technology product B2B and our audience is primarily male - engineers, managers, etc.

Your help is appreciated.

-GD