Mirroring iPad to Apple TV using local router and using data connection?

I have a iPad 3 or the new iPad and it's 3G. I plan on using this at trade shows so I can mirror what's on my iPad to the TV using Apple TV. We'll be using a local router instead of wi-fi because it's a fortune to purchase internet at shows. My question is once I access an app that requires 3g connection will I lose my connection to Apple TV?

If your cellular network allows you can turn on the “personal hotspot” feature on iPad and connect Apple TV to that network. Then you can AirPlay the content to Apple TV (not mirroring) and at the same time use the cellular 3G network for internet.