My wife and I had a chance to attend Col Grossman's 6 hour presentation in Denver this weekend. It was terrific and I highly recommend it. If you can not find a live presentation then get Dave's DVDs or the ones available at the store here. He will hold your attention for 6 hours and you will want to go a few more.
I was hoping to see him somewhere this year, but his schedule is bruttle. I did order the presentation for under $100 incluing the shipping. It's not like seeing him in person, but it will have to do.