If you want to stay in a Planet Bluegrass campground, your best bet would be to post something in the ticket exchange and check the returned tickets every Tuesday at noon (MST).
http://shop.bluegrass.com/index.php?main_page=index&cPath=93As far as vehicle passes, you can get them for many of the camp sights but they are only needed if you are going to camp in your car.
To specify about the extra tickets, nothing you see on the current line up will require any ticket other than the ones you've already got. The nightgrass announcements will be coming out later and those will require extra tickets. When it comes to nightgrass, don't hesitate to buy tickets. The last time Emmit-Nershi played, I believe they sold out in a matter of minutes. They go fast so be ready to jump on them as soon as they go on sale.
Listening to:
Steve Earl