From tvgameshows.net, this one's for those living in the Seattle area:
The 32' Wheelmobile will travel to Seattle on May 6 in order for participants to compete for lots of prizes including a trip to LA to try out for Wheel of Fortune & see a taping of the show. The RV will be at the Seahawks Stadium Exhibition Center north of Safeco Field from 2-6pm PDT.
Vanna White will throw out the first pitch before the Twins-Mariners game at 7:05pm PDT. Her 12-year son Nikko, who plays Little League there, will be there with her.
AFAIK, this is the first time I remember Vanna White throwing the first pitch at a Major League game. If she's done it before, when was the last time?