It was never the case that you got "all the points from the master bill." You received a substantial bonus (on a sliding scale depending on number of room nights, starting with ten) but then did not receive points on individual room charges. You did, however, receive additional points for catering charges.
I believe you received this by working with Marriott's meeting management people... you would certainly want to check with them, or more likely now that you've booked, with the meeting manager at your particular Marriott. I also have not used this bonus for several years, but I think there's a good chance some form of it exists, and I think you probably have a chance to get it if you nail it down before the actual meeting.