Coming into the show, take hwy 44 exit toward the city, get in the right lane and turn right on Knapp road. I expect you won't be be able to miss getting in, there will be cones everywhere. Follow their directions to parking, it might help to put a "Prepaid" sign in your windshield in very large type, but probably you just have to stop and show someone your parking ticket.
There is some private parking, but you've prepaid, so you don't want that. Just follow the cones and volunteers will direct you. Wherever you park, there is a traffic loop that goes around the museum and comes back out on 44, it goes counter clockwise. There might be an out to go south along Scholler, the loop will be high traffic, especially shortly after the airshow.
Tickets are at the main gate, which is marked on the map as EAA AirVenture.
View attachment 131493