Joe Ed
Make your reservations immediately and ask for the AMA discount. The control line dates (14 July through 20 July 2019) were posted by Dave Trible (Subject title: 2019 Nats dates) on the second page of this forum. There was another post (Subject title: 2019 Nats alert) by Allen Goff farther down under this thread concerning the Iron Man event, 13 and 14 July.
If you go to the Academy of Model Aeronautics web site, under Media Resources, click on Nats News on the left side of the screen. In Nats News select the Forms/Docs tab at the top left. Here are several documents relative to the 2018 Nats. The information in those documents, except for the dates, is likely to be the same as for the upcoming 2019 Nats. I thought that there was a list of hotels posted there as well, but I couldn't find it.
Don't wait!
Joe