5/8 Party Emergency

OK guys, in December (the end of this semester) we're celebrating being done with the classroom portion of vet school and starting clinics. It's a semi-classy party, at the Marriott, so I need to look amazing (meaning, of course, that I need a fabulous dress/accessories/shoes). I have that magenta thingy, but I don't think it's quite appropriate for this type of party-what do you guys think? So far this and this are the only dresses I've found...I'm thinking either dark or deep jewel tone or black or gray...I'm not really sure but I'd like your opinions!