Super Bowl Sunday is the biggest day for pizza sales in the United States yet the price of pizza isn't higher that day. The price of other things that use flour are also priced normally. Does this refute the law of supply and demand?

People in Athens, Jerusalem, Saigon, Warsaw, as well as New York, London, and Paris, live in countries where the government's role in the economy is very different. The level of taxes and government regulation is different. So is the amount of economic freedom. Yet I'm pretty sure that in all those cities you can find bread every day at a decent price and some pretty good choices of different kinds of bread. Yet that isn't true right now (in 2017) in Caracas, Venezuela.