if anyone lives in the area go up to RPI (15th and sage) and flyer the entire bridge that goes over 15th street and *EVERYONE* on campus will see it and want to go.
if you want to poster the union (student center) you have to get posters stamped and approved for display in the office inside the union which is open 9-5 or something normal like that.
also, go into the office in the union where the mailboxes are and dump a flyer into every fraternity/sorority mailbox. greek life is huge at rpi.
good luck