There are usually rules about having a certain number of posts by the time signups start and being a member for a certain amount of time, etc. If you do a search for past RAOKs you will see the rules under the first post of the thread
I found these rules from CoachGirl12:
http://forum.purseblog.com/coach/coach-holiday-10-raok-643048.html#post17192838
Id love to do a valentines raok! esp since valentines day is that day I married my husband who is soon to be my ex