1) Go here to request and/or offer something between now and December 18th. Fic, fanart, rec list, picspam... Any genre, any pairing. Whatever strikes your fancy.
2) Post and enjoy between December 18th and January 1st.
3) That's all, folks. You don't have to offer something to request something - though filling a request would be nice ;) - and vice-versa.
Of course, feel free to pimp this :)