I went to a Fabricio Werdum seminar last Saturday, for those who do not know he is a 2x Mundial champ at Blackbelt, and 2x Abu Dhabi champ. It was held at a local MMA gym here in town, and knowing this I expected him to teach mostly nogi and mma techniques (but I hoped to learn some BJJ moves)... and I was right. I didn't learn much as far as Jiu-Jitsu goes, which I hoped I would have. He never put on the gi, but did show one guard pass using gi, which I liked and started using alot lately. The rest of the moves he showed were mostly ground and pound and striking, I don't fight or train much MMA so I just had to go through the motions on those moves haha.
So lookout, seminars can let you down, depending on who they're geared for.. in this case it wasn't for me cause I mostly train gi. But I did have fun, Fabricio is a great guy and told alot of funny stories.