I received a message from the RMAF steering committe letting me know that the Marriott still has rooms available at the discount rate. Here's the critical information from that message "The Marriott let me know this morning there are plenty of rooms available. Unfortunately, their software is out of date and has a hard time dealing with more than one room rate at a time. They will again call their reservations center to try to get it straightened out".
So for now it's best to contact Bianca Carson, the show's contact at the hotel, and not Marriott's 800 reservations number.
RMAF Reservation Contact
Bianca Carlson 303-740-2590
bianca.carlson@marriott.com