I don't need the things in that box until Saturday evening, but there's no telling whether the box will show up on Saturday. (Yes, the hotel does get mail delivered on Saturdays.) This is unfortunately the flip side of using ordinary USPS Priority Mail rather than something like FedEx or UPS where I could find out where the box actually is. If the box doesn't arrive by about 4 PM Saturday, then I have to scramble to find more decks of cards and also buy a lot of AA batteries to record the Fannish Inquisition.
Also, if the box doesn't arrive on Saturday, I need for the hotel to arrange to refuse delivery when it eventually does arrive so that it goes back to the Bay Area -- the return address is my office.