The only promotion of which I am aware is the Refer Friends and Family, thru Marriott itself. This requires a current member to refer your partner; who then would receive an extra (bonus) 1K points on each of her first year stays. The same would apply to the referring member.
If you have a friend or FT buddy who has a Marriott account, they just go to the MR website and sign them up. If, for some reason, you do not, I would be happy to do it for you. I can always use the points!
(and you do not have to give anyone sensitive information to do it.........)