John... just a comment from a West Coast Rally organizer. I do the same thing. Everyone brings their own. Makes it real easy and simple.
HINT: If people bring their own disposable plates, they can write their name on the underside of the plate and leave it turned over where they want to sit thereby "reserving" their place at the table while they go mingle before dinner is served. A Chinet style platter is a great one to use.
Have a great rally!