Would LOVE to get to Oshkosh one year.
I like me you dont have the disposable income to go in person this year, then why not jump on VATSIM and fly virtual-oshkosh, check out their website following, they have an excellend scenery download and lots of info about how to fly the approaches, and are manning TWR during the day US time...
http://fs-mp.com/oshkosh/