Hi! I emailed Northwestern about Kemper and here is their response:
Entering freshmen are not assigned to Kemper Hall. It is an
upperclass only residence. More information on freshman housing will
be coming out in the next week. Please check out website at
http://www.northwestern.edu/housig/ next week for updates.
What was it about Kemper that interested you, maybe there is another dorm that would also fit your needs.