Well as someone who has spent the last 7 years creating graphics and video in the event industry I can tell you that video is becoming an even bigger part of corporate events. Especially given the state of the economy, corporations are using video as a cost effective means to get their message across. I have way too much corporate motion graphics work in my reel to prove it. Trying to replace some as we speak.
For instance, a typical multi-day event could have,
An opening video: Fast paced high impact video to get across the concepts of the meeting in an exciting flashy way that gets attendees excited, think 3 min commercial for the event.
Intro bumpers: Animated intros based on theme graphics for announcing speakers coming on stage.
Candids video: Video created on-site using photos or video taken of the event and attendees, shown on the last day.
These are just a few ways.