I worked on an event based on a film franchise and we had actors in the GMTV studio with children from a local school at the event asking them questions via a live link up. It went down really well despite the venue security not allowing the film crew initially because they mistook them for fans?!! We ended up getting a slot every half an hour throughout that programme which was brilliant publicity for us and helped us generate the longest queues to get in in the venue's history at the time. Worth waking our operations director up at 5am for!
Generally I would say ensure your A team are on duty, plan for various scenarios with the whole team so everyone knows what to do, make your event/venue look the best it can be - think about lighting, decoration, visitor flow, sound etc. and create a strong entrance for a really good first impression. On the day look after the production team as best you can. Best of luck. Let us know when we can see you on TV!