The simplest way is to just setup a router to connect to all the driver station laptops over Ethernet. Then configure the robot radios to bridge to that router. Make sure the router is setup for 5ghz and use a wifi analyzer app to find the cleanest frequency. Turn the wireless adapters on the laptops off like you do at the regional. You can put security on the wireless network and only distribute it to the teams or configure all the radios yourself if you want to be even more secure.
You could go as far as setting up the off-season FMS, this is much improved over the past few years.
http://www.firstinspires.org/resourc...-season-events
That way you could start and stop matches, etc. The guide for the off-season FMS also has instructions on setting up the router and connecting robots, etc.