Where should your wedding consultant be?

I am an event planner, you alwyas want to have the consultant be where you are getting married, they know the area, and have the understanding with all vendors to work together well. What if you need something on the wedding day will an out of state coordinator be able to get it for you? What if the DJ does not show up or is in a car accident? An in state planner will be able to call a backup.