I know that my school had a set move in weekend from Friday to Sunday. You COULD move in after that, but it was strongly suggested that you do it during move-in weekend because no one has time to move AND go to class on Monday.
I've never known a university to have move-in scheduled for the first day of school.
Are you missing move in weekend and HAVE to move in on Monday?
"Remember that apathy has no place in our Sorority." - Kelly Jo Karnes, Pi