In Elk Grove Village, IL...a suburb just NW of Chicago, there is a small catering outfit on Devon near Wooddale Road, and you pretty much would never know it was even there unless you were looking for it. (there's a Salt Creek BBQ and King Taco in the same area) Anyways, this place would publish a menu every monday, and have a buffet consisting of two entrees, and all your sides and dessert. It was open only for lunch, and you pay a small fee to enter a modest dining room, and its all you can eat from there. They had something different every day and the food was incredible. I mean, this was in no way a huge smorgabord like you get at old country buffet or the like, it was just as if they were catering somebody's personal affair, and you were just paying to join in.
either way, I just thought the whole concept was great. They pretty much were just hosting a 'public tasting' to promote their catering business that from what I could tell, it became a little bit of a lucritive side business in its own right....Its been a while since I've been out that way, I sure hope its still there...