Conference Kick-Of Sessions
Particularly if your conference is one of those rare events when everyone gets together e.g. annual sales conference, then get things off to a great start with an introductory "Conference Kick-Off Session" to break the ice and get people interacting and having fun. This will enhance syndicate work and relationship building throughout the conference.
High fun, indoor & outdoor activities interspersed throughout the conference will keep people on their toes and fired up for the next session!