Obvious Summerfest admission question isn't obvious enough!

[rosephile]

SO, if you buy a noon-4pm admission, are you all rounded up and kicked out at 4pm, or is it good all day (as long as you arrive before 4pm)? Summerfest.com and their ticket purchasing site simply say that admission is "good from noon to 4pm"...which could kind of go either way.
/hope somebody actually sees this