Posters are a good idea. They are generally the publicity chair's job but if they are not there at the beginning of the quarter you could take some posters to the dorms if you can. Just take them to the desk and they will post them for you. Check the list below to see how many each dorm allows and take a few extra in case these numbers have changed.

Dorm:                       # of Posters to take:
McCarty                   25 (10 for Hansee and 15 for McCarty)
Haggett                    18
Terry                        41 (for Terry, Lander, Mercer and Steven's Court)
McMahon                 22