Parking Lot for LATE SHOW

Hi,
I have never attended a late show, so my question is if I buy a parking pass online will a parking spot be reserved for me all night??

Or would I have to get there before the early show to guarantee a spot?

Thanks a bunch

When there is a lte show there are only a limited number of spaces available on line for purchase. After those are gone it is on a first come first serve basis, but don't arrive before the early show because the lot will be populated by people for the early show.