Hi,
Because I am an international student, I am arriving a few days earlier than my fellow peers. Am I allowed to move in early? Thanks 
Yes, definitely.They should have sent you some information about your move-in process (like time and date). If they haven’t, you should call or email whoever is running the international student orientation.
You definitely should have received info about move-in. The website that says that international students were invited to move in Aug. 18-19. There are some other special programs too. Contact the ISSS (contact info available on this link: http://www.vanderbilt.edu/isss/coming-to-vanderbilt/move-in/