Reminder if you don't mind crappy sandwiches. ... Though you probably had absolutely no idea, Nov. 3 is National Sandwich Day. (Nov. 2 is National Deviled Egg day and National Traffic Directors Day, if you’re curious). Consumers may never truly understand the madness behind all these “national” days—or solve the metaphysical conundrum of having more “national days” than days of the year—but they can avail themselves of the promotions they bring. For National Sandwich Day, that means two sandwiches for the price of one from Subway.