When did sandwiches deserve a day of recognition of their own? We also have national donut day, peanut butter fudge day, and even my participation favorite, National Absurdity Day. To get an idea for the depth and breadth of these traditions, please take a few minutes to look at the national calendar. https://nationaldaycalendar.com/november/
This calendar may give you some inspiration for a good display of government publications.