I'm jealous!
I've been to one really small convention, many moons ago. The bright spot was an appearance by George Takei. When I was in high school, Leonard Nimoy gave a talk at the University about futurism...and Trek too, of course. It was fun...he read parts of an essay he wrote as a dialog between himself and Spock, showed the Trek blooper reel, etc.
Other than that, nada.