Great question. Actually, I don't attend any Demo Days. I don't believe in Demo Days. I think they are a showcase of who is the best at on-stage presentations and who is the best coached.
I prefer to come before the Demo Day. I prefer 1-on-1 interaction. I like to get to know the companies, their issues, their struggles, their plans. Demo Day doesn't tell you any of that.
I'm not saying Demo Days have zero value. They teach companies to present their ideas cogently and in front of a crowd. But mostly they produce too much hype, too little value.
I should add then when I do attend events like TechCrunch Disrupt it's normally when I'm invited to speak. And I spend most of my time in the corridors talking with entrepreneurs & investors. My ADD is too strong to sit through a bunch of pitches.
Thanks for asking.