This is a response from Cheshire Figment to an earlier post about the same question:
"They do not use wristbands any more for any EMH. Technically only people who have a REsort ID are allowed to enter during morning EMH.
If you have a reservation for breakfast prior to Park opening and it is Morning EMH it is my opinion (not know fact) that you will not be allowed in unless your reservation is at CRT. Even though your name is on the list of people with ADRs, there is no way to penalize you for coming in with your name on the list and then going over to attractions. The reason CRT may have an exception is it is prepaid and if you are a no-show you wll lose the payment you made.
For Evening EMH even if you have a reservation, you will not be allowed into a restaurant during the MH period unless you have a Resort ID."
I don't mean to prolong the debate, since I certainly don't have the definitive answer. I would just hate to have the OP show up for her ADR and be refused admission because she isn't a resort guest - which, according to Cheshire Figment, is a real possibility and would be consistent with Disney policy. That's why I suggested she speak to Disney dining to be sure of the situation.