Cinco de Mayo was also a minor holiday that was easy to explain as the greatest military underdog story. It was explained as how an under equipped, underfed, and poorly trained Mexican army managed to repel Napoleon and his superior French army against all odds. It wasn't enough to create an exposition, but it was still fun.
Mexican food seemed to be a bit much, in Animalian opinion, especially since the spices left many an Animalian on the floor in tears. No one could easy explain why Mexican food was so spicy, so many Animalians didn't eat it. Again there was a lot less drinking in the celebration because Animalians still didn't like the taste of tequila, though it was less bad tasting than other alcohols they tried.
There were also smaller showcases of ancient Aztec culture, and colonial Spain, which helped shape Mexicane culture. The small Aztec ball game was a bit of fun, and there was also a showing of The Road to El Dorado. Animalians couldn't understand why aztecs performed human sacrifice, and also why the Spanish cruelty in their conquest.
The most fun thing was the piņata party, which was a thing that was the most fun. Animalians seemed to have an advantage over humans in whacking piņatas due to greater strength and enhanced senses, so newer, stiffer, "Animalian" piņatas filled with Animalian-safe candy were developed to somewhat level the field for Animalians.
Cinco de Mayo was another way to practice for the IAC, which was only two months away. Because there were more than one million people from around the world registered for the IAC, new hotels were being built as a fast pace, but Las Vegas offered to help with the crowds that were bound to arrive.