It was most likely a simple date mistake, everyone does it. To be honest, I never know what day it is until I actually have to check.
If you looked at my thread you may have not been in the position you are in now.
I swear they should hire me for these kinds of small things
Edit: Weekend PT events are always scheduled to stop at the END of the weekend (sunday midnight EST) this has been the case for the past several weeks and has not changed. This shouldn't have been such a big surprise.