National Cheeseburger Day Monday, September 18, 2017 10:00 AM 11:59 PM 10:00 23:59 Google Calendar ICS Celebrate National Cheeseburger Day at Caroline with our special Big Boy Burger. 2 pieces of 7 oz prime beef patties, aged white cheddar, peppered bacon, and a Jalapeno special sauce served on a butter toasted ciabatta bun with a side of fries. #yum