If you haven't done so already, then I'd suggest joining the EAA and getting the member's rate. Pre-booking is through
EAA AirVenture Oshkosh - The World's Greatest Aviation Celebration pre-booking available upto 15th June. You pay online, print out a bar-code that gets you straight through the ticket kiosk.
Get the full experience by camping there. Local private housing is also usually available up to the event.
I'll be flying in for the first time this year (3,500 mile round trip), which should put old PFA rallies into perspective.
There's always a special booth for overseas visitors with staff to help you with any problems. The overall organisation is much better than similar European events; very little queuing.