Backup plan: Party at my house...
Or actually... party at someone's house I wouldn't mind trashing...so any of the other Wildstang student's house...
As for Shedd and Museum of Science and Industry, they both close early, I want to say about 4-6 on weekdays. If you have transportation, I would suggest Sears Tower/a comedy club (there are a couple of really good ones)/State Street/Navy Pier/generally anything downtown can be fun. If you don't have transportation...hmm...well I don't know the Northwestern campus that well, but I know an AWESOME BBQ place close by!
::UPDATE:: Friday night we've also got...drumroll...YANNI!! WOO!! My Friday night is decided. ::ENDUPDATE::
aTm