Based on an on-site survey done in 2019, the parking and tram routes have been completely re-done, along with a whole bunch of other stuff. Read all about how things will work this year at
https://www.eaa.org/en/airventure.
Based on what I've heard at the monthly Chairman's conference calls, you can expect to park in the new Gray Lot which will have tons of buses going to the show. Don't know how aggressive the schedules will be on Sunday. Also, you can expect that the exhibit areas will not be open to the public on Sunday so that the exhibitors can finish setting up.
And while we all can probably find something to complain about if we look hard enough, after 30+ years of observing the operation from somewhat behind the scenes, including seven years on the Homebuilt Aircraft Council and 10+ years as Awards Chairman (nothing to do with judging), AirVenture has a lot of very smart, very knowledgeable, very dedicated volunteers working the details. Not perfect, of course, but very impressive. I'm continuously amazed at how many constraints have to be juggled to get *anything* done, just because there are so many groups with so many different needs.
As for wrist bands on Sunday, prices, early wristband purchases, etc., all that's on the web site and is left as an exercise for the reader, as the math books used to say.
Have a great time!