This may be a dumb question. My caterer says I should have salad plates (in addition to the 10 in dinner plates I'd already planned on having) "for overflow". However, The food will all be served in one go (salad included) and I can't imagine that people will be carrying two plates from the buffet line (if they wanted more, they could always go back through a second time with their plate). At least I've never seen two plates being used at once at any wedding with a buffet that I've gone to. She suggested that, if I didn't want to do the salad plates, I could just do 30 more large plates as a buffer incase people needed more plates...The savings isn't HUGE (just around 100 bucks), but I figured it's money I could save if I don't really need salad plates.