To a static car show with nothing happening ? Not very far.
You cant really compare that with the likes of SEMA or PRI though, which I would love to go to.
Furthest Ive travelled to take part and race is DHB in Denmark though.
I'd travel further to a race meet, or show with some sort of action at it long before I'd even think about a static show. And having been to Ford Fair at Silverstone once...even some shows with action arent really worth going to as a spectator.
Although have went to Malta to see the drag racing. It was a holiday too though, although planned deliberately to see the racing. Well worth it too.