Looking for some tips to promote your meeting? Check out these ideas from The Forum Effect. I would emphasize writer Susan Nowicky's fifth tip: "Market your meeting aggressively with regular targeted messages to your key attendee segments."
But I mean really target. Tell each segment (students, senior-level people, every niche your industry serves) specifically what they'll get out of it, which sessions are there just for them, people in their segment who will be speaking, special networking events just for them, etc.
And triple-check your database sort to make sure the right message goes out to the right person. There's nothing worse than getting a message that's beautifully targeted...to someone who's not remotely like you.