Dragon Boat Festival is coming, and advertisements for zongzi are everywhere. Eating zongzi on Dragon Boat Festival is a tradition. Why are there mung bean cakes now? Is there any explanation for this? There is nothing to say, because since it is a traditional festival, those businesses naturally want to take the opportunity to speculate and increase the sales of their products, such as the mung bean cake you mentioned. Not only mung bean cakes, but also red wine sellers. For example, merchants will say that red wine with zongzi will taste better and increase the atmosphere, so this red wine can be sold out.