Bigger beats smaller. At trade shows, I do that by compressing the first seven rows. I squeeze people in so tight, it's like they're dating. Online, that means packing your Web events with plenty of people. It's the law of increasing returns.
Simpler beats jazzier.
For trade shows, that means keeping technical jargon to a minimum. For Web events, simplicity means putting faces to names and sacrificing online features to enhance ease of use. So make it simple. The best Web sites are designed for morons. The right people beat the wrong people.