Ditch the Clock and Start on Your Own Time
You said 2 p.m. but you need to send your Aunt Eunice an Email and why does it matter if you start the event at 2:30? The media's already here so they'll stick around, right?
They may stick around for the story but it will more than likely be the last time they even bother showing up. Yours isn't the only story they're covering that day.
Make Them Walk Until They Drop
Videographers from TV stations are going to be carrying heavy gear. Design an obstacle course to make sure they have to walk as far as they can before getting to the location of your event.
If you happen to want them to come back, give them the easiest access possible. Even if you have the nicest lobby in town you want to show off but your building is 30,000 square feet and the event is in the back, help them get their vehicles as close to the back as possible so they don't have to traipse all over the building. If this isn't possible, another alternative would be to provide them means of transportation through golf carts or other small vehicles that they could at least put their gear in while traveling to the back of your building.
Don't Give Them Any Additional Info
After the event is over, wave goodbye and send them on their way. Don't feel the need to provide them with a packet of information or a product sample to help them write the story after they leave.
Surely, they'll get all the facts right from their brief visit. Surely.